JP2006184110A - Navigation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation apparatus for eliminating the sense of incongruity and uneasy feeling of a user who is guided in the direction opposite to the destination place. <P>SOLUTION: The navigation apparatus 100 searches a guide route from information on a map, a current location and the destination place, and is provided with an intersection arriving/leaving route determining means 6 for determining whether an intersection located on the searched guide route and guiding a turn is included in a special turn route for turning a direction by a plurality of the turns; and a guide content determining means 7 and a sound generating means 8 for implementing the sound announcement for indicating that the intersection is included in the special turn route, when the intersection is attained within a predetermined distance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a navigation device that searches for a guidance route from map information and information on a current location and a destination.

  2. Description of the Related Art Navigation devices equipped with a route guidance function for guiding a route to a destination by voice or a screen display are widely used for drivers who are driving. The route guidance function of the navigation device uses a map data to automatically search for a recommended route from the departure point to the destination using a computer. The searched route is stored as a guidance route. For example, the route is displayed on a map screen including the current travel position with a line of a predetermined color or thickness that can be distinguished from other roads. When the vehicle enters within a predetermined distance before the intersection on the guidance route, the next traveling direction is guided by voice, or an illustration image or icon imitating an actual destination guidance board is displayed. In this way, in a navigation device that guides the traveling direction at any time and guides to the destination, for example, a navigation device that performs voice guidance only when the road exiting the intersection is not a road that is a road, etc. Various devices have been proposed (see, for example, Patent Document 1).

  There are usually three types of exit patterns from intersections: left turn, straight advance, and right turn. For this reason, in conventional navigation devices, left turn, straight advance, and right turn are determined for each intersection called a node based on automatically searched guidance route information. When any information is held and approaching the intersection, the traveling direction is guided by voice or image display with reference to node information of the intersection.

  By the way, in other countries, when the vertical line separation roads intersect, as shown in FIG. 15 and FIG. 16, a P-shaped turn that changes direction by a plurality of turns in the same direction or a plurality of times including different directions. There is a road (in this case, the vehicle is on the right) where a left turn is allowed only by a special turn called a C-shaped turn that changes direction by turning. When there is such a road on the guidance route, the route guidance by the conventional navigation device is as follows.

  For example, in the P-shaped turn of FIG. 15, after going straight at the A intersection, the voice guidance “right direction” and the display of the icon indicating the right turn are repeated three times after the B intersection. In addition, in the C-shaped turn of FIG. 16, after the voice guidance “right direction” and the icon indicating the right turn are displayed at the A intersection, the voice guidance “left direction” and the icon indicating the left turn are displayed. Is repeated twice.

  In this way, in the P-shaped turn or C-shaped turn, the driver must first turn to the opposite right side even though the destination is in the left turn direction. Except when it is recognized from the screen display (for example, when a small-scale wide area map is being displayed and the shape such as P-shaped or C-shaped can be grasped from the route display) In some cases, the direction of travel may give the driver a sense of discomfort and anxiety. While driving, it may be unfavorable to pay attention to the screen display, and there is a strong tendency to grasp information related to the traveling direction by voice guidance, and the influence is particularly remarkable in such a situation.

  For example, at the intersection where a P-shaped turn or a C-shaped turn is started, if the driver can guide that the subsequent series of right / left turns is the process of making a left turn toward the destination, the driver will feel uncomfortable or anxious. There is no feeling. However, in the conventional navigation device, as described above, since the node only holds information on how to leave the intersection, the driver is informed that it is a P-shaped turn or a C-shaped turn. I couldn't.

Japanese Patent Laid-Open No. 2002-71371 (page 3-5, FIG. 1)

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a navigation device that can eliminate a user's uncomfortable feeling and anxiety with respect to route guidance indicating a direction opposite to the destination. .

  The navigation device of the present invention is a navigation device that searches for a guidance route from map information and information on the current location and destination, and an intersection on the searched guidance route that induces a turn is a plurality of turns. And a voice notification for performing a voice notification to the effect that the intersection is included in the special turning route at a timing when the intersection approaches within a predetermined distance. Means.

  According to the above configuration, it is determined that an intersection that induces a turn on the searched guidance route is included in a special turn route that changes direction by a plurality of turns, and the intersection is a special turn route. By performing the voice notification to the effect that the user is included, the user can recognize that the intersection on the guidance route is included in the special turning route, so the user feels uncomfortable or uneasy about the route guidance showing the direction opposite to the destination. A feeling can be eliminated.

  Further, in the navigation device of the present invention, the determination means includes the number of links exiting from the intersection, so that the intersection is included in a special turning route that changes direction by a plurality of turns in the same direction. It is determined that

  Further, in the navigation device of the present invention, since the determination unit has an end point node of a link that does not constitute the guide route among the links leaving the intersection, the intersection has a different direction. It is determined to be included in a special turning route that changes direction by a plurality of turnings.

  The navigation device of the present invention is a navigation device that guides a route to turn left by avoiding a direct left turn at an intersection that prohibits a direct left turn, and uses the data indicating the current position and the data indicating the intersection to There is provided control means for controlling whether or not to notify the informing unit that a direct left turn is avoided according to the distance between the current position and the intersection.

  Further, the navigation device of the present invention is characterized in that the control means notifies the user that a direct left turn at the intersection is avoided by an image.

  The navigation device of the present invention is characterized in that the control means causes an image to indicate that the route is a C-shaped route if the route for avoiding a direct left turn at the intersection is a C-shaped route. Is.

  The navigation device of the present invention is characterized in that the control means causes an image to indicate that the route is a P-shaped route if the route for avoiding a direct left turn at the intersection is a P-shaped route. Is.

  Further, the navigation device of the present invention is characterized in that the control means informs by voice that a direct left turn is avoided at the intersection.

  In the navigation device of the present invention, if the route for avoiding a direct left turn at the intersection is a C-shaped route, the control means causes a voice notification that the route is a C-shaped route. Is.

  Further, the navigation device of the present invention is characterized in that if the route for avoiding a direct left turn at the intersection is a P-shaped route, the control means informs by voice that the route is a P-shaped route. Is.

  Further, the navigation device of the present invention is a navigation device for guiding a route for making a right turn while avoiding a direct right turn at an intersection that prohibits a direct right turn, using the data indicating the current position and the data indicating the intersection. There is provided control means for controlling whether or not to notify the informing unit that a direct right turn is avoided in accordance with the distance between the current position and the intersection.

  Further, the navigation device of the present invention is characterized in that the control means informs that a direct right turn at the intersection is avoided by an image.

  The navigation device of the present invention is characterized in that the control means causes an image to indicate that the route is a C-shaped route if the route for avoiding a direct right turn at the intersection is a C-shaped route. Is.

  In the navigation device of the present invention, if the route for avoiding a direct right turn at the intersection is a P-shaped route, the control unit causes an image to indicate that the route is a P-shaped route. Is.

  Further, the navigation device of the present invention is characterized in that the control means informs by voice that a direct right turn at the intersection is avoided.

  In the navigation device of the present invention, the control means may notify the user that the route is a C-shaped route if the route for avoiding a direct right turn at the intersection is a C-shaped route. Is.

  Furthermore, the navigation device of the present invention is characterized in that if the route for avoiding a direct right turn at the intersection is a P-shaped route, the control means informs by voice that the route is a P-shaped route. Is.

  According to the present invention, it is determined that an intersection that induces a turn on the searched guidance route is included in a special turn route that changes direction by a plurality of turns, and the intersection is a special turn route. By performing the voice notification to the effect that the user is included, the user can recognize that the intersection on the guidance route is included in the special turning route. You can proceed along the route without anxiety.

  Hereinafter, a navigation device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In all the drawings for explaining the embodiments, the same reference numerals are given to those having the same function, and the explanation will not be repeated.

[Embodiment 1]
FIG. 1 is a diagram showing an internal configuration of the navigation device according to Embodiment 1 of the present invention. The navigation device 100 searches for a guidance route from map data and information related to the current location and destination. The map data storage unit 1, the map data reading unit 2, the current location detection unit 3, the input unit 4, and the route search unit. 5, intersection exit route determination means 6, guidance content determination means 7, voice generation means 8, display control means 9, display means 10, and system control means 11.

  The map data storage means 1 is formed of a recording medium such as a CD-ROM or a hard disk that stores map data including data such as road and building shapes. The map data reading means 2 is formed by a CD-ROM drive device or a hard disk drive device that reads map data from the map data storage means 1. The current location detection means 3 is formed of a GPS (Global Positioning System) unit or the like and detects the current location of the vehicle. The input unit 4 includes a switch for the user to set a destination. Further, the route search means 5 searches for a guidance route from the current location detected by the current location detection means 3 to the destination set by the input means 4.

  The intersection exit route determination means 6 determines that an intersection that induces a turn on the guidance route searched by the route search means 5 is included in a special turning route that changes direction by a plurality of turns. Yes, a determination is made regarding the exit route, which will be described later. The guidance content determination means 7 determines the guidance content for voice and screen display from this determination result and map data. The voice generation means 8 outputs the guidance content determined by the guidance content determination means 7 as synthesized voice. That is, the guidance content determination unit 7 and the voice generation unit 8 perform voice notification that the intersection is included in the special turning route at the timing when the intersection approaches within a predetermined distance. The display control means 9 includes map data read by the map data reading means 2, display data created from the guidance route data calculated by the route search means 5, display icon data determined by the guidance content determination means 7, etc. The drawing process is performed based on the above. The display means 10 is configured by a liquid crystal display, an organic EL display, or the like that displays map data, icons, etc. drawn by the display control means 9.

  Further, the system control unit 11 uses a RAM (not shown) as a work area according to a control program stored in a ROM (not shown), and performs overall control of each unit to execute navigation processing. Note that the above-described units are connected to each other so as to be able to transmit data as shown in the figure.

  By the way, the map data read out from the map data storage means 1 and used are map data used for displaying a map, route search data used for route search, road data used for route guidance and map matching, address Management information that defines the contents and recording format of these data, including index data for calling up a specific map from the name of the facility and voice data, and voice data for voice guidance. Is also stored in the map data storage means 1. The road data includes data on coordinate points (nodes) and lines (links) describing roads including intersections, such as node numbers of nodes, longitudes, latitudes, link numbers of links, link distances, road types, and route numbers. The link type, road width, traffic regulation, shape interpolation point coordinates, etc. are acquired.

  Next, the operation of the navigation device configured as described above will be described. Note that the guidance route search operation for searching for the optimum route to the destination based on the current location and destination information and map data may use a well-known method, so a detailed description thereof will be omitted. The operation of the navigation device after confirmation is described. In the following, a road on which the vehicle is on the right side will be described as an example.

  FIG. 2 is a flowchart showing the procedure of the intersection information guidance operation of the navigation device according to the first embodiment of the present invention. First, while traveling on the guidance route, the intersection exit route determination unit 6 determines whether or not the intersection is approaching on the front guidance route based on the current location information and the map data from the current location detection unit 3 (ie, approaching). Whether or not the middle node is an intersection node) is detected (step S101). When the approach of the intersection is detected, the intersection exit route determination means 6 performs an exit route determination process for the intersection node (step S102).

  Here, the exit route determination processing of the intersection node will be described in detail. 3 and 4 are flowcharts showing the operation procedure of the intersection node exit route determination process. In FIG. 3, it is determined whether or not the intersection is a P-shaped turn. In FIG. It is determined whether or not it is a character-shaped turn.

  First, the flowchart of FIG. 3 will be described. The intersection exit route determination means 6 searches the intersection (target intersection) that has been detected to be approaching whether there is a link that constitutes the guidance route among the links that exit the intersection (step S201). ). Then, the intersection exit route determination means 6 determines whether or not the link constituting the guidance route is 2 (step S202), and if it is 2, the intersection is determined to be a P-shaped turn (step S203). ). On the other hand, if it is not 2, the intersection exit route determination means 6 determines that the intersection is not an intersection that makes a special change of direction, but an intersection that makes a normal right / left turn or goes straight (step S204).

  For example, assuming a state in which the guidance route is fixed as shown by a dotted line with an arrow at the intersection shown in FIG. 5, the link constituting the guidance route with the link exiting from the point L at the intersection is the link C and the link C Two of G. Accordingly, this intersection is determined to be a P-shaped turn, that is, an intersection included in the special turning route.

  Next, the flowchart of FIG. 4 will be described. The intersection exit route determination means 6 searches the target intersection for whether or not there is a link that does not constitute a guide route among the links exiting the intersection (step S301). In determining whether there is a link that does not constitute the guide route (step S302), if there is a link, the intersection exit route determination means 6 next searches whether the end point node of the link exists on the guide route. (Step S303). If the end node exists on the guidance route, the intersection exit route determination means 6 determines that the intersection is a C-shaped turn (step S304). On the other hand, when the end node of the link does not exist on the guidance route, the process returns to step S301 again to search for the link. If there is no link that does not constitute a guide route among the links that exit the intersection, the intersection exit route determination means 6 does not turn on the intersection included in the special turning route, but makes a normal right / left turn or straight ahead. It is determined that the intersection is to perform (step S305).

  For example, assuming a state in which the guidance route is fixed as shown by a dotted line with an arrow at the intersection shown in FIG. 6, a link that exits from the point K at the intersection and is not a guidance route is from the point K to the point L. There is a link that extends, but the end point of this link is on the guidance path at point L. Therefore, this intersection is determined to be a C-shaped turn, that is, an intersection included in the special turning route.

  This is the end of the intersection node exit route determination process. By this determination process, it can be determined whether the intersection of interest is included in a special turning route such as a P-shaped turn or a C-shaped turn, or is an intersection that performs a normal right / left turn or straight ahead.

  Returning to the flowchart of FIG. 2, next, voice guidance and screen display according to the type are performed based on the determination by the intersection exit route determination means 6. In other words, when it is determined that the intersection of interest is an intersection that makes a P-shaped turn, the guidance content determination means 7 displays on the screen “approximately OOm ahead, P-shaped turn” as the voice guidance text. Select a P-shaped turn icon as the icon. Then, the sound generation means 8 outputs sound, and the display means 10 outputs an image via the display control means 9 (step S104).

  FIG. 7 is a screen display example on the display means 10 when it is detected that a P-shaped turn is made at a front intersection. A map of a scale that can be recognized as a P-shaped turn is selected, and a guidance route is displayed on the map with a color and thickness specified in advance so that it can be visually recognized as a P-shaped turn. Is displayed. In addition, an icon imitating a road sign of a P-shaped turn is displayed in large size in the lower right part of the screen. These displays may be blinked.

  Similarly, when it is determined that the intersection of interest is an intersection where a C-shaped turn is performed, the guidance content determination means 7 displays “approximately OOm ahead, C-shaped turn” as the voice guidance text. Select the C-turn icon as the display icon. Then, the sound generation means 8 outputs sound, and the display means 10 outputs an image via the display control means 9 (step S105).

  FIG. 8 is a screen display example on the display means 10 when it is detected that a C-shaped turn is made at a front intersection. A map of a scale that can be recognized as a C-shaped turn is selected, and a guidance route is displayed on the map with a color and thickness specified in advance so that it can be visually recognized as a C-shaped turn. Is displayed. In addition, an icon imitating a road sign of a C-shaped turn is displayed in the lower right part of the screen. These displays may be blinked.

  On the other hand, when it is determined that the target intersection is an ordinary right / left turn or straight intersection, guidance processing similar to the conventional one is performed (step S106). For example, in the case of an intersection where the guidance route is determined to be a simple left turn, a screen display as shown in FIG. 9 is performed, and voice guidance “about XX m ahead, turn right” is performed. In addition, in the case of an intersection where the guidance route is determined to be straight, a screen display as shown in FIG. 10 is performed, and voice guidance is not performed because the intersection is not an intersection whose traveling direction changes.

  When any one of the guidance processes from step S104 to S106 is completed, the process returns to step S101 again, and the intersection information guidance operation is repeatedly executed every time the intersection approaches.

  As described above, according to the navigation device in the first embodiment of the present invention, a notification that a P-shaped turn or a C-shaped turn is present at the intersection included in the special turning route is displayed by voice and screen display. Thus, the driver can preliminarily estimate that the vehicle will temporarily turn in the direction opposite to the destination, and can drive without feeling uncomfortable or uneasy.

  The intersection exit route determination means 6 can use conventional node information by determining that the target intersection is included in the special turning route according to the flow shown in FIG. 3 and FIG. high. Each node may have information indicating that the node is included in the special turn route. According to this configuration, the exit route can be determined for each intersection without executing the flows shown in FIGS. 3 and 4, so that the processing load can be reduced.

[Embodiment 2]
FIG. 11 is a diagram showing an internal configuration of the navigation device according to Embodiment 2 of the present invention. The navigation device 200 shown in FIG. 11 is different from the navigation device 100 of the first embodiment in that an intersection exit route search means 12, an intersection exit route selection means 13, and an intersection exit route storage means 14 are added. Different.

  The intersection exit route search means 12 can return to the guidance route by avoiding a turn along the searched guidance route at the intersection for each intersection on the searched guidance route that induces a turn. Search for a route. In addition, the intersection exit route search unit 12 records a selection history in an intersection exit route storage unit 14 described later, or grasps a selection history of an exit route at an arbitrary intersection with reference to the record. The intersection exit route selection means 13 selects a desired one from a plurality of exit routes searched by the intersection exit route search means 12 and notified to the user via the display means 10. The selection operation is performed by the driver via the input unit 4. The intersection exit route storage unit 14 stores the actual exit route from the target intersection based on the current location information from the current location detection unit 3 and the selection information from the intersection exit route selection unit 13. Since other configurations are the same as those of the navigation device of the first embodiment, description thereof is omitted.

  Next, of the operations of the navigation device configured as described above, the operation after the guide route is determined will be described. In the following, a road on which the vehicle is on the right side will be described as an example.

  FIG. 12 is a flowchart showing the procedure of the intersection information guidance operation of the navigation device in the second embodiment of the present invention. First, while traveling on the guidance route, the intersection exit route determination unit 6 determines whether or not the intersection is approaching on the front guidance route based on the current location information and the map data from the current location detection unit 3 (ie, approaching). Whether or not the middle node is an intersection node) is detected (step S401). When the approach of the intersection is detected, the intersection exit route determination means 6 determines whether or not the intersection is an intersection that induces turning (step S402).

  If it is determined in step S402 that the target intersection is an intersection that induces turning, the intersection exit route searching means 12 avoids turning along the searched guidance route at the intersection and returns to the guidance route. A possible route is searched (step S403). Specifically, in step S403, the intersection exit route searching means 12 searches for a route that prioritizes the P-shaped turn, a route that prioritizes the C-shaped turn, and a route that prioritizes the normal left turn, and uses three routes. To find a route that can leave the intersection. Further, in step S403, a route that can leave the intersection immediately before entering the intersection may be searched within a radius Xm from the intersection. Note that in the route search in step S403, the search time becomes longer as the number of searches increases, so it is preferable to set the number of searches in advance. The searched route is displayed on the screen via the display control means 9 and the display means 10 (step S404). By displaying the searched route, at least one of the searched routes is notified to the user. The searched route may be notified to the user by voice output.

  FIG. 13 is a diagram illustrating a screen display example when a plurality of routes that can be returned to the guide route while searching for a turn along the guide route are searched. FIG. 13 shows a P-shaped turn and a C-shaped turn that can be returned to the guidance route by avoiding a simple left turn at an intersection (point L) determined to perform a simple left turn on the searched guidance route. An example of a screen display when two types of routes are retrieved is shown. Since this P-shaped turn or C-shaped turn can finally join the guidance path, it is detected as an option for the exit path.

  Returning to the flowchart of FIG. 12, the intersection exit route searching means 12 grasps which route has been selected or actually traveled with respect to the notified exit routes (step S405), and the result. Information is stored in the intersection exit route storage means 14 (step S406). The route is selected by, for example, touching an icon indicating a desired route on the screen of the display unit 10 configured with a touch panel. Further, by tracking the current location information from the current location detection means 3, it is possible to grasp the exit route actually traveled.

  FIG. 14 is a flowchart showing an application example of the display processing (step S404) of a plurality of exit routes in the flowchart of FIG. The intersection exit route search means 12 refers to the selection result information of the past route at the intersection stored in the intersection exit route storage means 14 after searching the exit route for an arbitrary intersection (step S501). Then, the difference exit route searching means 12 determines the display priority based on the past route selection result information (step S502), and performs screen display according to the priority (step S503). For example, if there is a history of a simple left turn with a P-shaped turn for a beginner in driving, the display of FIG. 13 displays such that a P-shaped turn can be preferentially selected. Alternatively, it may be set to display only the exit route with the largest number of times selected in the past. In this case, since only one exit route is displayed, the driver's selection operation can be omitted.

  As described above, according to the navigation device in the second embodiment of the present invention, for each intersection that induces a turn on the searched guidance route, the turn along the searched guidance route at the intersection is performed. By avoiding and searching for a route that can be returned to the guidance route, even if the vehicle avoids a turn along the searched guidance route at a certain intersection, it returns to the guidance route. Since a possible route is searched, it is not necessary to re-search for a guidance route to the destination every time it temporarily deviates from the guidance route. Therefore, it is possible to prevent unnecessary guidance route re-search processing from being executed.

  In the above embodiment, the intersection exit route determination process is performed every time the vehicle travels. However, when the navigation device user inputs the destination and the guidance route is determined, the destination is determined. The intersection exit route determination process is executed for all the intersections that induce the turn until the time, and data indicating that it is included in a special turn route such as a P-shaped turn or a C-shaped turn is stored in advance in the corresponding node (intersection). You may make it hold. In this case, it is not necessary to perform a determination process during traveling, and an icon display indicating that the vehicle is turning and voice guidance can be performed when the vehicle approaches the intersection.

  Further, the example in which the vehicle searches for the route of the P-shaped turn or the C-shaped turn on the right-hand traffic road has been described above. However, even if the vehicle is a left-hand traffic road, the P-shaped turn or the C-shaped route is used. There can be turns and the invention can be implemented as described above.

  The present invention determines that an intersection that induces a turn on the searched guidance route is included in a special turn route that changes direction by a plurality of turns, and the intersection is included in the special turn route. By performing the voice notification to the effect, the user can recognize that the intersection on the guidance route is included in the special turning route, so that the user may feel uncomfortable or anxious about the route guidance showing the opposite direction to the destination. This is useful for a navigation device or the like that searches for a guidance route from map information and information on the current location and destination.

The figure which shows the internal structure of the navigation apparatus in Embodiment 1 of this invention. The flowchart which shows the procedure of the intersection information guidance operation | movement of the navigation apparatus in Embodiment 1 of this invention. Flow chart (P-shaped turn) showing the operation procedure of exit route determination processing of an intersection node Flow chart (C-shaped turn) showing the operation procedure of exit route determination processing at an intersection node The figure for demonstrating the judgment that it is an intersection which makes a P-shaped turn The figure for explaining the judgment that it is the intersection which performs special turning Example of screen display on display means when it is detected that a P-shaped turn is made at an intersection in front Screen display example in the display means when it is detected that a C-shaped turn is made at the intersection in front Screen display example on the display means when it is detected that a normal left turn is made at the intersection ahead Screen display example on the display means when it is detected that the vehicle goes straight at the intersection ahead The figure which shows the internal structure of the navigation apparatus in Embodiment 2 of this invention. The flowchart which shows the procedure of the intersection information guidance operation | movement of the navigation apparatus in Embodiment 2 of this invention. Example of screen display when multiple routes that can be returned to the guidance route are searched by avoiding turning along the guidance route Flow chart showing an application example of display processing of a plurality of exit routes The figure which shows the conventional example of guidance in the intersection which performs P character type turn The figure which shows the example of the conventional guidance in the intersection which performs a C-shaped turn

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Map data memory | storage means 2 Map data read-out means 3 Present location detection means 4 Input means 5 Route search means 6 Intersection exit route determination means 7 Guidance content determination means 8 Voice generation means 9 Display control means 10 Display means 11 System control means 100 Navigation apparatus

Claims (17)

A navigation device that searches for a guide route from map information and information about a current location and a destination,
A determination unit that determines that an intersection that induces a turn on the searched guide route is included in a special turn route that changes direction by a plurality of turns, and
Voice notification means for performing voice notification that the intersection is included in the special turning route at a timing when the intersection approaches within a predetermined distance;
A navigation device comprising:   2. The determination unit according to claim 1, wherein the number of links exiting from the intersection is two, so that the intersection is included in a special turning route that turns by a plurality of turns in the same direction. Navigation device.   The determination means changes the direction of the intersection by a plurality of turns including different directions when an end point node of a link that does not constitute the guidance route among the links exiting from the intersection exists on the guidance route. The navigation device according to claim 1, wherein it is determined that the route is included in a special turning route. A navigation device that guides a route to make a left turn while avoiding a direct left turn at an intersection that prohibits a direct left turn,
Control means for controlling whether to notify the informing unit that a direct left turn at the intersection is avoided using data indicating the current position and data indicating the intersection according to the distance between the current position and the intersection Navigation device.   The navigation device according to claim 4, wherein the control unit causes an image to notify that a direct left turn at the intersection is avoided.   6. The navigation device according to claim 5, wherein the control means causes an image to notify that the route is a C-shaped route if the route that avoids a direct left turn at the intersection is a C-shaped route.   6. The navigation device according to claim 5, wherein the control means causes an image to indicate that the route is a P-shaped route if the route for avoiding a direct left turn at the intersection is a P-shaped route.   5. The navigation device according to claim 4, wherein the control means informs by voice that a direct left turn is avoided at the intersection.   9. The navigation device according to claim 8, wherein the control means causes a voice notification that the route is a C-shaped route if the route that avoids a direct left turn at the intersection is a C-shaped route.   9. The navigation device according to claim 8, wherein the control means causes a voice notification that the route is a P-shaped route if the route that avoids a direct left turn at the intersection is a P-shaped route. A navigation device that guides a route to turn right by avoiding a direct right turn at an intersection that prohibits a direct right turn,
Control means for controlling whether to notify the informing unit that a direct right turn at the intersection is avoided by using data indicating the current position and data indicating the intersection according to the distance between the current position and the intersection Navigation device.   The navigation device according to claim 11, wherein the control unit causes an image to notify that a direct right turn at the intersection is avoided.   The navigation device according to claim 12, wherein the control means causes an image to notify that the route is a C-shaped route if the route that avoids a direct right turn at the intersection is a C-shaped route.   The navigation device according to claim 12, wherein if the route that avoids a direct right turn at the intersection is a P-shaped route, the control means notifies the user that the route is a P-shaped route.   The navigation device according to claim 11, wherein the control means notifies the user that a direct right turn at the intersection is avoided.   16. The navigation device according to claim 15, wherein the control means causes a voice notification that the route is a C-shaped route if the route that avoids a direct right turn at the intersection is a C-shaped route.   The navigation device according to claim 15, wherein if the route that avoids a direct right turn at the intersection is a P-shaped route, the control means informs by voice that the route is a P-shaped route.

Images