JP5002521B2 - Navigation device, navigation method and program - Google Patents

Description

  The present invention relates to a navigation device for a vehicle, and more particularly to a technique for providing a guide route that is easy to understand for a user driving a vehicle.

  A vehicle navigation device is a device that supports a user's driving by providing route guidance from a departure place to a destination. In the navigation device, when a user sets a departure point and a destination, a route search for a guide route from the departure point to the destination is performed. Some of such navigation devices have a function of setting a route (a weak route) that the user does not want to pass during route search. However, in such a navigation device, it is necessary for the user to set a route that is not good at the time of route search, and the setting operation takes time. Moreover, the place where the poor route can be set is limited to the place where the user has been.

One of the driving places that users are not good at is an intersection. Therefore, conventionally, a navigation system having a function for determining a user's poor driving location (intersection) has been proposed (see, for example, Patent Document 1). In this conventional system, the weak place (intersection) determined based on the second-order differential value (jerk) of the vehicle speed is recorded. Then, at the time of route search, the risk cost of the poor place (intersection) is calculated and displayed on the screen, and the user's poor route setting operation is assisted.
JP 2005-326287 A

  By the way, some navigation devices for vehicles are provided with a function of an intersection guidance mode for performing special detailed traveling guidance (intersection traveling guidance) when a vehicle passes through an intersection. The user can drive the vehicle according to the guide route by driving according to the driving guide for the intersection. However, there are various shapes of intersections (three-way intersections, five-way intersections), and there are various entry and exit angles. For this reason, among various intersections, there are intersections that cause the user to make a mistake in driving even when traveling guidance for the intersection is provided. Such an intersection is an intersection where it is difficult for the user to understand the driving guidance for the intersection, and it is desirable that the route search does not pass through the intersection (to make a detour) (a detour intersection). I can say that.

  However, the conventional navigation system does not take into account the detour intersection where it is difficult to create a driving guide for an intersection as described above, and as a result, an easy-to-understand guidance route may not be provided to the user who drives the vehicle. There was a problem.

  The present invention has been made in view of the above problems, and provides a navigation device capable of performing a route search in consideration of a detour intersection and capable of providing an easy-to-understand guide route for a user driving a vehicle. The purpose is to do.

  The navigation device of the present invention is an intersection guidance mode determining means for determining whether or not the vehicle is in an intersection guidance mode for performing driving guidance when passing through an intersection for a user driving a vehicle, and the intersection guidance mode. A workload measuring means for measuring a workload related to the user's driving when passing through the intersection when determined; and based on the measurement result of the workload, the intersection is the driving guide for the user. And avoiding an intersection having the same or similar feature as the feature of the detour intersection when performing a route search of the guide route to the user and a detour intersection determination means for determining whether or not the detour intersection is difficult to understand Route search control means for controlling the route search as described above.

  As a result, the workload of the user in the intersection guidance mode is measured, and it is determined whether or not it is a detour intersection based on the measurement result of the workload. Then, when searching for a guide route to the user, the route search is controlled so as to avoid an intersection having the same or similar characteristics as the detour intersection. In this way, a route search considering a detour intersection is performed, and an easy-to-understand guide route is provided to the user who drives the vehicle.

  In the navigation device of the present invention, the feature may be a shape of the intersection or an entry / exit angle.

  Thereby, when the shape of the intersection (three-way intersection, five-way intersection, etc.) and the approach / exit angle are the same as or similar to the detour intersection, the route search is controlled so as to avoid the intersection.

  In the navigation device of the present invention, the workload related to driving the vehicle includes a visual workload caused by a user's visual action when driving the vehicle, and the detour intersection determination The means may determine that the intersection is the detour intersection when the visual workload of the user when passing through the intersection is higher than a predetermined detour determination reference value.

  This way, if the user's visual workload is high when passing through an intersection (for example, if the user frequently moves his gaze and pays too much attention to passing the intersection) It is determined that it is an intersection. In this way, it is possible to determine the detour intersection based on the visual workload of the user driving the vehicle.

  In the navigation device of the present invention, the workload related to driving the vehicle includes an auditory workload caused by a user's auditory motion when driving the vehicle, and the detour intersection determination The means may determine that the intersection is the detour intersection when the user's auditory workload when passing through the intersection is lower than a predetermined detour determination reference value.

  Thus, if the user's auditory workload when passing through an intersection is low (eg, if the user is paying too much attention to the intersection's driving guidance by reducing the audio volume) It is determined that this is a detour intersection. In this way, it is possible to determine a detour intersection based on the auditory workload of the user driving the vehicle.

  In the navigation device of the present invention, the workload related to the driving of the vehicle includes a device operation workload resulting from the user's device operation when operating the device provided in the vehicle, The detour intersection determination unit may determine that the intersection is the detour intersection when the user's device operation workload when passing through the intersection is lower than a predetermined detour determination reference value.

  Thus, when the user's equipment operation workload when passing through the intersection is low (for example, when the user stops operating the navigation or air conditioner and pays too much attention to traveling at the intersection), the intersection is It is determined that this is a detour intersection. In this way, it is possible to determine a detour intersection based on the device operation workload of the user driving the vehicle.

  In the navigation device of the present invention, the workload related to driving of the vehicle includes a driving workload caused by a user's driving operation when driving the vehicle, and the detour intersection determination means is When the user's driving workload when passing through the intersection is higher than a predetermined detour determination reference value, the intersection may be determined to be the detour intersection.

  Thereby, when the driving workload of the user when passing the intersection is high (for example, when the user makes a sudden lane change when traveling through the intersection), the intersection is determined to be a detour intersection. Is done. In this way, it is possible to determine the detour intersection based on the driving workload of the user driving the vehicle.

  In the navigation device of the present invention, the workload related to driving the vehicle includes an intrinsic workload caused by a user's psychological state when driving the vehicle, and the detour intersection determination means May determine that the intersection is the detour intersection when the intrinsic workload of the user when passing through the intersection is higher than a predetermined detour determination reference value.

  Thus, if the user's intrinsic workload when passing through the intersection is high (for example, if the user's heart rate or pulse is excessively high when driving through the intersection), the intersection is a detour intersection It is determined that In this way, it is possible to determine a detour intersection based on the intrinsic workload of the user driving the vehicle.

  In the navigation device of the present invention, the control means increases the cost value of an intersection having the same or similar feature as the feature of the detour intersection when performing a route search for a guide route to the user. May be performed.

  As a result, the cost value of the intersection having the same or similar characteristics as the detour intersection is increased, and the intersection is avoided when the route search is performed. By such cost value control, a route search that avoids a detour intersection is performed, and an easy-to-understand guide route is provided to the user who drives the vehicle.

  The navigation method of the present invention determines whether or not it is an intersection guidance mode for performing travel guidance when passing the intersection for the user driving the vehicle, and when it is determined that the intersection guidance mode, Measure a workload related to the user's driving when passing through the intersection, and based on the measurement result of the workload, whether the intersection is a detour intersection where it is difficult for the user to understand the driving guidance When the route search for the guide route to the user is performed, the route search is controlled so as to avoid an intersection having the same or similar feature as the feature of the detour intersection.

  According to this method, the workload of the user in the intersection guidance mode is measured, and it is determined whether or not it is a detour intersection based on the measurement result of the workload. Then, when searching for a guide route to the user, the route search is controlled so as to avoid an intersection having the same or similar characteristics as the detour intersection. In this way, a route search considering a detour intersection is performed, and an easy-to-understand guide route is provided to the user who drives the vehicle.

  The navigation program of the present invention determines whether or not the computer is in the intersection guidance mode for determining whether or not the computer is in the intersection guidance mode for performing traveling guidance when passing the intersection for the user who drives the vehicle. The intersection is difficult for the user to understand the driving guidance based on the process of measuring the workload related to the user's driving when passing the intersection and the measurement result of the workload. Control of the route search so as to avoid an intersection having the same or similar feature as the feature of the detour intersection when performing the process of determining whether or not it is a detour intersection and the route search of the guide route to the user The process which performs is performed.

  Also according to this program, the workload of the user in the intersection guidance mode is measured, and it is determined whether or not it is a detour intersection based on the measurement result of the workload. Then, when searching for a guide route to the user, the route search is controlled so as to avoid an intersection having the same or similar characteristics as the detour intersection. In this way, a route search considering a detour intersection is performed, and an easy-to-understand guide route is provided to the user who drives the vehicle.

  According to the present invention, a user's workload in the intersection guidance mode is measured, a bypass intersection is determined based on the measurement result of the workload, and an intersection having the same or similar characteristics as the bypass intersection is avoided. By performing the route search control, it is possible to perform a route search in consideration of a detour intersection, and to provide an easy-to-understand guide route for a user driving the vehicle.

  Hereinafter, a navigation device according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, the case of a navigation device for a vehicle mounted on an automobile is illustrated. This navigation device has a function of performing a route search in consideration of a detour intersection, and this function is realized by a program stored in an HDD or a memory of the device.

  First, the structure of the navigation apparatus of this Embodiment is demonstrated using drawing. FIG. 1 is a block diagram of a navigation device. As shown in FIG. 1, the navigation device 1 is installed in a vehicle, a map DB 2 (database) in which map data is stored, a route search unit 3 that searches for a route for a guide route to a user using the map data, and the vehicle. A travel guide unit 6 is provided that provides travel guidance to the user using the monitor 4 and the speaker 5. The travel guide unit 6 has a function of an intersection guide mode for performing special detailed travel guidance (travel guidance for an intersection) when the vehicle passes the intersection. And this navigation apparatus 1 is provided with the intersection guidance mode determination part 7 which determines whether the driving | running | working guidance part 6 is an intersection guidance mode.

  Moreover, the navigation apparatus 1 is provided with the workload measurement part 8 which measures the workload relevant to a user's driving | operation. The workload measurement unit 8 obtains data related to the user's contribution behavior while driving the vehicle from the line-of-sight camera 9, the vehicle sensor 10, and the biological sensor 11 mounted on the vehicle, and the user's work when passing through the intersection Has the ability to measure the load.

  The workload of the user who is driving the vehicle is classified into a plurality of different workloads according to the type of user's contribution behavior that contributes to the workload. Here, the types of workload of the user who is driving the vehicle and the contribution data of the workload will be described.

  The user's workload while driving the vehicle includes a visual workload resulting from the user's visual behavior when driving the vehicle. The workload measurement unit 8 obtains data related to visual workload contribution behavior (for example, user's viewpoint movement speed data and viewpoint coordinate data while driving the vehicle) from the line-of-sight camera 9, and measures the visual workload. I do.

  In addition, the user's workload while driving the vehicle includes an auditory workload caused by the user's auditory motion when driving the vehicle. The workload measurement unit 8 obtains data relating to auditory workload contribution behavior (for example, voice information data or music information data included in route guidance or audio playback while driving the vehicle) from the vehicle sensor 10, and Measure the auditory workload.

  Moreover, the user's workload during driving of the vehicle includes a device operation workload caused by the user's device operation when operating the device provided in the vehicle. The workload measuring unit 8 acquires data (for example, navigation operation data, audio operation data, air conditioner operation data, window opening / closing operation data, etc. during driving of the vehicle) from the vehicle sensor 10 regarding the contribution behavior of the device operation workload, Measure equipment operation workload.

  The user's workload while driving the vehicle includes a driving workload caused by the user's driving operation when driving the vehicle. The workload measurement unit 8 acquires data (for example, steering angle data, vehicle speed data, inter-vehicle distance data, accelerator opening rate data, brake signal data, etc. during driving of the vehicle) from the vehicle sensor 10 regarding contribution behavior of the driving workload. To measure the operating workload.

  Further, the workload of the user who is driving the vehicle includes an intrinsic workload caused by the psychological state of the user when driving the vehicle. The workload measurement unit 8 acquires data (for example, heart rate data, blood pressure data, respiration rate data, etc. of a user who is driving the vehicle) from the biological sensor 11 regarding the contribution behavior of the intrinsic workload, and the intrinsic workload. Measure.

  The workload measurement unit 8 calculates the workload value from the user's contribution behavior while driving the vehicle by using a quantification model for calculating the workload value for each of a plurality of workloads related to the driving of the vehicle. be able to. As the quantification model, for example, a formulation model constructed by deriving the relationship between the user's contribution behavior data and the workload value by a statistical method, a probability constructed using a Bayesian network, a neural network, etc. An inference model is used.

  Returning to FIG. 1, the configuration of the navigation device 1 will be described. The navigation device 1 includes a detour intersection determination unit 12 that determines whether or not the intersection is a detour intersection (intersection where it is difficult for the user to understand the driving guidance for the intersection) based on the measurement result of the workload. .

  Here, the detour intersection will be specifically described with reference to FIGS. FIG. 2 is a diagram illustrating an example of a detour intersection. FIG. 2 shows an example in which the vehicle passes through a three-way intersection. In this example, a wide road on which the vehicle is traveling turns slightly to the right at the intersection, and a narrow road branches to the left from the intersection.

  The travel guide unit 6 determines whether to turn right, left, or go straight at the intersection based on the approach / exit angle of the intersection (the angle between the entry direction and the exit direction), the road width, and the like. Therefore, when making a slight right turn at an intersection as shown in FIG. 2, the entry / exit angle of the intersection is small (about 30 degrees) and the road width is the same. Travel guidance may be performed. In this case, the user does not know whether to proceed to the left or right, and may accidentally proceed to the left where it should originally proceed to the right. That is, it is difficult for the user to understand such travel guidance, and it can be said that such an intersection corresponds to a detour intersection.

  FIG. 3 is a diagram illustrating another example of the detour intersection. FIG. 3 shows an example in which the vehicle passes through a five-way intersection. In this example, the road on which the vehicle is running branches into five at the intersection. When proceeding to the road at the back left at such an intersection, there may be a travel guidance “Please turn left at the next intersection.” In this case, the user does not know whether to proceed to the road on the left front side or the road on the left back side, and may accidentally proceed to the road on the left front side where the user should originally proceed to the road on the left back side. That is, it is difficult for the user to understand such travel guidance, and it can be said that such an intersection corresponds to a detour intersection.

  FIG. 4 is a diagram illustrating still another example of the detour intersection. FIG. 4 shows an example in which the vehicle passes through successive intersections. In this example, two intersections are continuously provided at the end of the road on which the vehicle is traveling. When making a left turn at a second intersection at such a continuous intersection, a travel guidance “Please turn left at the next intersection” may be performed. In this case, the user does not know whether to make a left turn at the front intersection or the back intersection, and the user should accidentally turn left at the front intersection at the back intersection. That is, it is difficult for the user to understand such travel guidance, and it can be said that such an intersection corresponds to a detour intersection.

  As shown in FIG. 1, the navigation device 1 includes a detour intersection DB 13, and the feature data of the intersection determined as the detour intersection by the detour intersection determination unit 12 as described above is stored in the detour intersection DB 13. Is done. The characteristic data of the detour intersection includes data on the shape of the intersection (three-way intersection, five-way intersection, etc.) and data on the entrance / exit angle of the intersection (30 degrees, etc.).

  In addition, the navigation device 1 includes a search control unit 14 that controls the route search unit 3. When the route search unit 3 searches for a guide route to the user, the search control unit 14 avoids an intersection having a feature that is the same as or similar to the feature of the detour intersection stored in the detour intersection DB 13. The route search unit 3 is controlled.

  About the navigation apparatus 1 comprised as mentioned above, the operation | movement is demonstrated using FIG. 5 and FIG. Here, the operation of the route search control considering the detour intersection, which is a feature of the present invention, will be described.

  FIG. 5 is a flowchart showing an operation flow of the navigation device 1 of the present embodiment. As shown in FIG. 5, in the navigation device 1, first, the intersection guidance mode determination unit 7 determines whether or not the travel guidance unit 6 is in the intersection guidance mode (S1). When it is determined that the vehicle is in the intersection guidance mode (when the vehicle driven by the user passes through the intersection), the data of the shape of the intersection and the entry / exit angle are acquired (S2).

  And the workload measurement part 8 acquires contribution action data from the visual line camera 9, the vehicle sensor 10, and the biological sensor 11, and a workload is measured for every some workload (S3). After measuring the workload, the detour intersection determination unit 12 determines whether the workload (for example, visual workload) is equal to or greater than a predetermined detour determination reference value (S4). As a result, when the measured visual workload exceeds the detour determination reference value, it is determined that the intersection is a detour intersection (S5), and the feature data of the intersection is stored in the detour intersection DB 13 ( S6).

  Thereafter, when the route search unit 3 performs a route search (S7), the search control unit 14 reads out the feature data of the detour intersection from the detour intersection DB 13 and avoids the same or similar intersection as the detour intersection. The route search unit 3 is controlled so as to be performed (S8).

  Note that FIG. 5 illustrates the case where the visual workload is measured to determine the detour intersection, but the scope of the present invention is not limited to this, and other workloads (auditory workload) The detour intersection can be determined in the same manner using an equipment operation workload, an operation workload, and an intrinsic workload.

  FIG. 6 is a diagram illustrating an example of route search control in consideration of such a detour intersection. FIG. 6A shows a guide route obtained as a result of normal route search (conventional route search) performed by the route search unit 3, and this guide route is similar to the detour intersection illustrated in FIG. Intersection is included. In such a case, the route search control in consideration of the detour intersection as described above is performed. FIG. 6B is a guide route as a result of performing route search control in consideration of a detour intersection. Thus, a guide route that does not pass through the same intersection as the detour intersection is provided.

  According to the navigation device 1 of the present embodiment as described above, the user's workload in the intersection guidance mode is measured, and a bypass intersection is determined based on the measurement result of the workload. By performing route search control so as to avoid intersections with similar characteristics, it is possible to perform route searches that take into account detour intersections, and provide easy-to-understand guidance routes for users who drive vehicles .

  That is, in the present embodiment, the user's workload in the intersection guidance mode is measured, and it is determined whether or not it is a detour intersection based on the measurement result of the workload. Then, when searching for a guide route to the user, the route search is controlled so as to avoid an intersection having the same or similar characteristics as the detour intersection. In this way, a route search considering a detour intersection is performed, and an easy-to-understand guide route is provided to the user who drives the vehicle.

  Specifically, in the present embodiment, when the intersection shape (three-way intersection, five-way intersection, etc.) and the approach / exit angle are the same as or similar to the detour intersection, the route search is performed so as to avoid the intersection. Is controlled.

  Also, in this embodiment, when the user's visual workload is high when passing through an intersection (for example, when the user frequently moves his / her line of sight and pays too much attention to the intersection) The intersection is determined to be a detour intersection. In this way, it is possible to determine the detour intersection based on the visual workload of the user driving the vehicle.

  In the present embodiment, when the user's auditory workload when passing through the intersection is low (for example, when the user is paying too much attention to the driving guidance at the intersection by lowering the audio volume) Is determined to be a detour intersection. In this way, it is possible to determine a detour intersection based on the auditory workload of the user driving the vehicle.

  Further, in the present embodiment, when the user's device operation workload when passing through the intersection is low (for example, when the user stops operating the navigation and the air conditioner and pays excessive attention to the traveling of the intersection). Is determined to be a detour intersection. In this way, it is possible to determine a detour intersection based on the device operation workload of the user driving the vehicle.

  In the present embodiment, when the user's driving workload when passing through the intersection is high (for example, when the user makes a sudden lane change when traveling through the intersection), the intersection is detoured. It is determined that it is an intersection. In this way, it is possible to determine the detour intersection based on the driving workload of the user driving the vehicle.

  In the present embodiment, when the user's intrinsic workload when passing through the intersection is high (for example, when the user's heart rate or pulse becomes excessively high when traveling through the intersection), The intersection is determined to be a detour intersection. In this way, it is possible to determine a detour intersection based on the intrinsic workload of the user driving the vehicle.

  In this embodiment, the cost value of an intersection having the same or similar characteristics as that of a detour intersection is increased, and the intersection can be avoided when a route search is performed. By such cost value control, a route search that avoids a detour intersection is performed, and an easy-to-understand guide route is provided to the user who drives the vehicle.

  The embodiments of the present invention have been described above by way of example, but the scope of the present invention is not limited to these embodiments, and can be changed or modified according to the purpose within the scope of the claims. is there.

  As described above, the navigation device according to the present invention can perform a route search in consideration of a detour intersection, and has an effect of providing an easy-to-understand guide route for a user driving a vehicle. It is useful as a navigation device for vehicles mounted on automobiles.

It is a block diagram of the navigation apparatus of this Embodiment. It is a figure which shows an example of a detour intersection. It is a figure which shows the other example of a detour intersection. It is a figure which shows the further another example of a detour intersection. It is a flowchart which shows the flow of operation | movement of the navigation apparatus of this Embodiment. It is a figure which shows an example of the route search control of this Embodiment.

Explanation of symbols

1 Navigation device 2 Map DB
DESCRIPTION OF SYMBOLS 3 Path | route search part 4 Monitor 5 Speaker 6 Traveling guidance part 7 Intersection guidance mode determination part 8 Workload measurement part 9 Eye-gaze camera 10 Vehicle sensor 11 Biosensor 12 Detour intersection determination part 13 Detour intersection DB
14 Search control unit

Claims (8)

An intersection guidance mode determination means for determining whether or not the vehicle is in an intersection guidance mode for performing travel guidance when passing the intersection for a user who drives the vehicle;
A workload measuring means for measuring a workload related to the user's driving when passing through the intersection when it is determined that the intersection guidance mode is set;
Detour intersection determination means for determining whether or not the intersection is a detour intersection where it is difficult for the user to understand the travel guidance based on the measurement result of the workload;
A route search control means for controlling the route search so as to avoid an intersection having the same or similar feature as the feature of the detour intersection when performing a route search of the guide route to the user;
Equipped with a,
The workload associated with driving the vehicle includes an auditory workload resulting from a user's auditory behavior when driving the vehicle,
The detour intersection determination means determines that the intersection is the detour intersection when the user's auditory workload when passing through the intersection is lower than a predetermined detour determination reference value. apparatus. An intersection guidance mode determination means for determining whether or not the vehicle is in an intersection guidance mode for performing travel guidance when passing the intersection for a user who drives the vehicle;
A workload measuring means for measuring a workload related to the user's driving when passing through the intersection when it is determined that the intersection guidance mode is set;
Detour intersection determination means for determining whether or not the intersection is a detour intersection where it is difficult for the user to understand the travel guidance based on the measurement result of the workload;
A route search control means for controlling the route search so as to avoid an intersection having the same or similar feature as the feature of the detour intersection when performing a route search of the guide route to the user;
Equipped with a,
The workload related to the driving of the vehicle includes a device operation workload resulting from a user's device operation when operating a device provided in the vehicle,
The detour intersection determining means determines that the detour is the detour intersection when the user's device operation workload when passing through the intersection is lower than a predetermined detour determination reference value. apparatus. The features, the navigation device according to claim 1 or claim 2, characterized in that a shape or entrance exit angle of the intersection. The said control means performs cost value control which raises the cost value of the intersection which has the same or similar characteristic as the characteristic of the said detour intersection when performing the route search of the guidance route to the said user. The navigation device according to any one of claims 1 to 3 . It is determined whether or not it is an intersection guidance mode for performing travel guidance when passing the intersection for a user driving a vehicle,
Measuring the workload associated with the user's driving when passing the intersection when it is determined to be in the intersection guidance mode;
Based on the measurement result of the workload, it is determined whether the intersection is a detour intersection where it is difficult for the user to understand the travel guidance,
A navigation method for controlling the route search so as to avoid an intersection having the same or similar feature as that of the detour intersection when performing a route search for a guide route to the user ,
The workload associated with driving the vehicle includes an auditory workload resulting from a user's auditory behavior when driving the vehicle,
In the determination of the detour intersection, when the user's auditory workload when passing through the intersection is lower than a predetermined detour determination reference value, it is determined that the intersection is the detour intersection. Method. It is determined whether or not it is an intersection guidance mode for performing travel guidance when passing the intersection for a user driving a vehicle,
Measuring the workload associated with the user's driving when passing the intersection when it is determined to be in the intersection guidance mode;
Based on the measurement result of the workload, it is determined whether the intersection is a detour intersection where it is difficult for the user to understand the travel guidance,
A navigation method for controlling the route search so as to avoid an intersection having the same or similar feature as that of the detour intersection when performing a route search for a guide route to the user ,
The workload related to the driving of the vehicle includes a device operation workload resulting from a user's device operation when operating a device provided in the vehicle,
In the determination of the detour intersection, the navigation apparatus determines that the detour intersection is the detour intersection when the user's device operation workload when passing through the intersection is lower than a predetermined detour determination reference value. Method. On the computer,
A process of determining whether or not it is an intersection guidance mode for performing a travel guidance when passing the intersection for a user driving a vehicle;
A process of measuring a workload related to the user's driving when passing the intersection when it is determined that the intersection guidance mode is set;
Based on the measurement result of the workload, the process of determining whether the intersection is a detour intersection that is difficult for the user to understand the travel guidance,
A process of controlling the route search so as to avoid an intersection having the same or similar feature as the feature of the detour intersection when performing a route search of the guide route to the user;
A navigation program for executing
The workload associated with driving the vehicle includes an auditory workload resulting from a user's auditory behavior when driving the vehicle,
In the determination of the detour intersection, when the user's auditory workload when passing through the intersection is lower than a predetermined detour determination reference value, it is determined that the intersection is the detour intersection. program. On the computer,
A process of determining whether or not it is an intersection guidance mode for performing a travel guidance when passing the intersection for a user driving a vehicle;
A process of measuring a workload related to the user's driving when passing the intersection when it is determined that the intersection guidance mode is set;
Based on the measurement result of the workload, the process of determining whether the intersection is a detour intersection that is difficult for the user to understand the travel guidance,
A process of controlling the route search so as to avoid an intersection having the same or similar feature as the feature of the detour intersection when performing a route search of the guide route to the user;
A navigation program for executing
The workload related to the driving of the vehicle includes a device operation workload resulting from a user's device operation when operating a device provided in the vehicle,
In the determination of the detour intersection, the navigation apparatus determines that the detour intersection is the detour intersection when the user's device operation workload when passing through the intersection is lower than a predetermined detour determination reference value. program.