CN101532846B - Road navigation method and device - Google Patents
Road navigation method and device Download PDFInfo
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- CN101532846B CN101532846B CN2009100824956A CN200910082495A CN101532846B CN 101532846 B CN101532846 B CN 101532846B CN 2009100824956 A CN2009100824956 A CN 2009100824956A CN 200910082495 A CN200910082495 A CN 200910082495A CN 101532846 B CN101532846 B CN 101532846B
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Abstract
The invention provides a road navigation method and a device. The method comprises the followings: step A, at least one path from the place of departure to the destination is computed and obtained according to a road data model; step B, a navigation path selected by a driver from the at least one path is received; step C, whether a dangerous section exists on the currently selected navigation path is judged according to the information of the dangerous section of the road data model; if so, corresponding information of the dangerous section is promoted to the driver and step D comes out; otherwise, guiding is carried out according to the currently selected navigation path so that the flow path is ended; step D, the command inputted by the driver is received and analyzed: step B is returned when the command indicates reselecting navigation path; otherwise, the guiding is carried out according to the currently selected navigation path, and corresponding dangerous information of the dangerous section is promoted to the driver before the driver arrives at the dangerous section. According to the invention, the driving safety of the driver can be improved.
Description
Technical field
The present invention relates to field of navigation technology, concrete, relate to a kind of road navigation method and device.
Background technology
GPS (GPS, Global Position System) onboard navigation system can provide to driver's license and drive guiding, is very easy to driver's trip, and increasing motor vehicle all begins to assemble the GPS navigation system.
Because the complicacy of road conditions, may exist the various factors that has influence on driver's driving safety on the driving path of driver between from origin to destination, as zig zag.At present, though the GPS onboard navigation system on the market can realize setting at the user the correct guiding of destination, mostly do not consider driver's driving safety.
Summary of the invention
Technical matters to be solved by this invention provides a kind of road navigation method and device, drives danger by the driving path of planning the driver in advance to evade, and has improved driver's driving safety.
For solving the problems of the technologies described above, it is as follows to the invention provides scheme:
A kind of road navigation method comprises:
Steps A, the road data model according to setting up in advance calculates at least one path of departure place to the destination;
Step B provides the information in described at least one path to the driver, and receives the guidance path that the driver selects from described at least one path;
Step C, information according to the Dangerous Area of setting up in advance in the described road data model, whether judge on the guidance path of current selection dangerous highway section, and on judging the guidance path of current selection, during dangerous highway section, then point out corresponding Dangerous Area information to the driver;
Step D receives and resolves the instruction of driver's input: return step B when reselecting navigation path is indicated in described instruction; Otherwise,, and arrive described Dangerous Area forward direction driver the driver and point out on the described Dangerous Area corresponding dangerous information according to the guidance path channeling conduct of current selection.
Preferably, in the above-mentioned road navigation method, among the described step C, on judging the guidance path of current selection not during dangerous highway section, then according to the guidance path channeling conduct and the process ends of current selection.
Preferably, in the above-mentioned road navigation method, in the described steps A, judge further whether described at least one path has only one: if then select this path as guidance path and enter step e; Otherwise, enter step C;
Step e, guidance path channeling conduct and process ends according to current selection, wherein, in bootup process, further according to the information of the Dangerous Area of setting up in advance in the described road data model, judge the Dangerous Area that exists on the guidance path of current selection, and arrive Dangerous Area forward direction driver the driver and point out on the Dangerous Area corresponding dangerous information.
Preferably, in the above-mentioned road navigation method, describedly arrive described Dangerous Area forward direction driver the driver and point out on the described Dangerous Area corresponding dangerous information to be: the distance between driver and described Dangerous Area reach predetermined alarm apart from the time, point out on the described Dangerous Area dangerous information accordingly by voice to the driver.
Preferably, in the above-mentioned road navigation method, described Dangerous Area is the highway section that has predetermined hazards, and described Dangerous Area specifically comprises: zig zag highway section, many bends highway section, highway section, abrupt slope and have the highway section of barrier.
Preferably, in the above-mentioned road navigation method, also comprised before described steps A: the hazard index of the various Dangerous Areas of importing in advance according to the driver sets in advance the hazard index of various Dangerous Areas in described road data model;
In the described steps A, after calculating described at least one path, further, determine Dangerous Area included on each path according to the Dangerous Area information that sets in advance in the described road data model; According to the hazard index of the various Dangerous Areas that set in advance, add up the hazard index of each paths; According to the hazard index of each paths, select the minimum path of hazard index, and whether the prompting driver selects safest guidance path channeling conduct: after the affirmation indication that receives the driver, according to the minimum path channeling conduct of described hazard index; After the rejection indication that receives the driver, enter step B.
Preferably, in the above-mentioned road navigation method, the information of setting up described Dangerous Area in described road data model comprises: according to the Dangerous Area information of gathering in advance, increase in the data structure corresponding with Dangerous Area in described road data model:
The dangerous node ID of Dangerous Area;
The road section that dangerous node connects;
The hazard types of this danger node ID correspondence;
The type of vehicle of this danger node ID correspondence;
The alarm distance of this danger node ID correspondence;
Dangerous time range on the Dangerous Area.
The present invention also provides a kind of road navigation device, comprises path-calculating element, first interactive unit, judging unit, second interactive unit, first navigation elements and second navigation elements; Wherein,
Described path-calculating element is used for the road data model that basis is set up in advance, calculates at least one path of departure place to the destination, and triggers described first interactive unit;
Described first interactive unit, be used for triggering according to the described path-calculating element or second interactive unit, provide the information in described at least one path to the driver, and behind the guidance path that the reception driver selects, trigger described judging unit from described at least one path;
Described judging unit, be used for after the triggering that receives described first interactive unit, information according to the Dangerous Area of setting up in advance in the described road data model, whether judge on the guidance path of current selection dangerous highway section: if then point out corresponding Dangerous Area information and trigger described second interactive unit to the driver; Otherwise, trigger described first navigation elements;
Described second interactive unit is used for the triggering according to described judging unit, receives and resolve the instruction of driver's input: trigger described first interactive unit when reselecting navigation path is indicated in described instruction; Otherwise, trigger described second navigation elements;
Described first navigation elements is used for the guidance path channeling conduct according to current selection;
Described second navigation elements is used for the guidance path channeling conduct according to current selection, and arrives described Dangerous Area forward direction driver the driver and point out on the described Dangerous Area corresponding dangerous information.
Preferably, in the above-mentioned road navigation device, comprise that also hazard index is provided with unit and the 3rd navigation elements; Wherein,
Described hazard index is provided with the unit, is used for the hazard index of the various Dangerous Areas imported in advance according to the driver, sets in advance the hazard index of various Dangerous Areas in described road data model;
Described path-calculating element is further used for according to the Dangerous Area information that sets in advance in the described road data model, determining Dangerous Area included on each path after calculating described at least one path; According to the hazard index of the various Dangerous Areas that set in advance, add up the hazard index of each paths; According to the hazard index of each paths, select the minimum path of hazard index, and whether the prompting driver selects safest guidance path channeling conduct: after the affirmation indication that receives the driver, trigger described the 3rd navigation elements; After the rejection indication that receives the driver, trigger described first interactive unit.
Described the 3rd navigation elements is used for according to the minimum path channeling conduct of described hazard index.
Preferably, in the above-mentioned road navigation device, also comprise a direct navigation elements, described path-calculating element comprises a judgment sub-unit;
Described judgment sub-unit is used to judge whether described at least one path has only one: if then select this path as guidance path and trigger described direct navigation elements; Otherwise, trigger described first interactive unit;
Described direct navigation elements, be used for guidance path channeling conduct according to current selection, and in bootup process, information according to the Dangerous Area of setting up in advance in the described road data model, judge the Dangerous Area that exists on the guidance path of current selection, and arrive Dangerous Area forward direction driver the driver and point out on the Dangerous Area corresponding dangerous information.
Preferably, in the above-mentioned road navigation device, described second navigation elements, be further used for distance between driver and described Dangerous Area reach predetermined alarm apart from the time, point out corresponding dangerous information on the described Dangerous Area by voice to the driver.
Preferably, in the above-mentioned road navigation device, described Dangerous Area is the highway section that has predetermined hazards, and described Dangerous Area specifically comprises: zig zag highway section, many bends highway section, highway section, abrupt slope and have the highway section of barrier.
Preferably, in the above-mentioned road navigation device, also comprise:
Dangerous Area is set up the unit, is used for according to the Dangerous Area information of gathering in advance, increases in the data structure corresponding with Dangerous Area in described road data model:
The dangerous node ID of Dangerous Area;
The road section that dangerous node connects;
The hazard types of this danger node ID correspondence;
The type of vehicle of this danger node ID correspondence;
The alarm distance of this danger node ID correspondence;
Dangerous time range on the Dangerous Area.
From the above as can be seen, road navigation method provided by the invention and device, in the road data model, increase Dangerous Area information, before formal guiding to the driver according to the danger on the Dangerous Area information indicating path, thereby can when planning driver's enforcement path, just avoid dangerous driving path in advance, reach the purpose that improves driving safety.And, the present invention also further is provided with the hazard index of different Dangerous Areas according to driver's input in the road data model, and then when path computing, add up the hazard index of various feasible paths and the most suitable this driver's guidance path is provided, thereby further improved driver's driving safety.
Description of drawings
Fig. 1 is the process flow diagram of the described road navigation method of the embodiment of the invention;
Fig. 2 is the structural representation of the described road navigation device of the embodiment of the invention.
Embodiment
Road navigation method provided by the invention and device had been planned driver's enforcement path in advance before the formal guiding to the driver, in the hope of avoiding dangerous driving path, thereby reach the purpose that improves driving safety.The present invention is further illustrated by specific embodiment below with reference to accompanying drawing.
The Dangerous Area information that present embodiment is gathered in advance, and when making map of navigation electronic, Dangerous Area information is based upon in the road data model.Here, described Dangerous Area is meant there is dysgenic highway section in driver's driving safety, for example, the various Dangerous Areas shown in the traffic mark board comprise zig zag highway section, many bends highway section, highway section, abrupt slope, falling rocks multi-happening section and have highway section of barrier or the like.Need when the driver travels on these Dangerous Areas especially carefully to avoid taking place the traffic accident accident.
Please refer to Fig. 1, the described road navigation method of present embodiment may further comprise the steps:
Here, the GPS navigation system determines driver's current location (departure place), receives the destination of driver's input, and then according to the path of road data Model Calculation departure place to the destination, this path has one, two or many.
Here, the routing information that the GPS navigation system can calculate in driver's step display 11 by screen is selected to offer the user.The driver can import its selected guidance path as modes such as touch-screen, keyboard inputs by various input modes.
Whether step 13 according to the information of the Dangerous Area of setting up in advance in the described road data model, judges on the guidance path of current selection dangerous highway section: if then enter step 15; Otherwise, enter step 14;
Here, after the driver had selected guidance path, the GPS navigation system did not directly begin guiding, but whether judged on the guidance path of driver selection dangerous highway section, and pointed out corresponding Dangerous Area information to the driver when dangerous highway section.Different drivers has different driving efficiencies, and the driver can judge whether oneself can travel according to the Dangerous Area information that the GPS navigation system provides on this Dangerous Area, and then whether decision needs to select other path to navigate.If the driver selects other path to navigate, then return step 12, select to offer the selectable path of driver again; If the driver has selected to have the guidance path of Dangerous Area, the distance of GPS navigation system between driver and described Dangerous Area reach predetermined alarm apart from the time, can point out corresponding dangerous information on the described Dangerous Area to the driver by voice.Certainly, after returning step 12 by step 15, can also offer from last time and form new path after deducting the last selected guidance path of driver the path that the driver selects, again this new path be offered the driver, from this new path, select a bar navigation path by the driver.
By above flow process, present embodiment, was planned in advance to driver's driving path that the driver can avoid the path in dangerous highway section according to the Dangerous Area information on the path, thereby can be improved driver's driving safety before formal guiding.
Below the explanation present embodiment is how on the function basis of existing navigational system, increases the content of making road hazard information.
Present embodiment is according to the Dangerous Area information of gathering in advance, increases in the data structure corresponding with Dangerous Area in described road data model: the dangerous node ID of Dangerous Area; The hazard types of this danger node ID correspondence; The type of vehicle of this danger node ID correspondence; The alarm distance of this danger node ID correspondence; Dangerous time range on the Dangerous Area.
Concrete, as shown in table 1 below, present embodiment is to make dangerous information in the highway section of road data model (electronic data) (representing with LINK): according to the real road situation of gathering in advance, set up the road data model, and in the road data model, write down position, type and the satellite information (satellite information comprises type of vehicle, alarm distance, time range etc.) of dangerous information according to the structure of " line-point ".
| ?LINK?ID | NODE?ID | TYPE | Type of vehicle | The alarm distance | Time |
| ?LINK1 | NODE1 | 1 (falling rock) |
Table 1
In the table 1, NODE ID represents the dangerous node ID of Dangerous Area;
LINK ID represent to link to each other with this danger node ID from driving the ID that direction arrives the highway section of this node;
TYPE represents the hazard types of Dangerous Area, as falling rock, zig zag, highway section, abrupt slope etc.;
Type of vehicle is represented the type of vehicle of this danger node ID correspondence, and hazard types that promptly should danger node ID correspondence is the vehicle at this type of vehicle, and this Dangerous Area does not constitute danger to other vehicle outside this type of vehicle; When whether the GPS navigation system judges on the guidance path of current selection dangerous highway section in step 13, can be further according to the type of vehicle of the type of vehicle of the current driving of driver and the Dangerous Area correspondence on the guidance path, whether judge on the guidance path dangerous highway section;
Alarm distance expression when the driver apart from the distance of this Dangerous Area reach this alarm apart from the time, need prompt alarm;
Dangerous time range on this Dangerous Area of time representation.
As can be seen, in the above-mentioned road model data dangerous node is produced on the road LINK, makes that the position of dangerous node is more accurate, when guiding, can realize accurate guiding.
Present embodiment can also further provide humanized navigation feature at different drivers.Below describe.
Different drivers' driving efficiency, psychological quality and physical efficiency can be different, and same driver also can change to some extent at the driving ability of different time.For example, driver's first may think that the driving ability of oneself can adapt to this highway section of zig zag fully, and the highway section of therefore taking a sudden turn is very little for driver's first danger; On the contrary, driver's second may think that the zig zag highway section is to oneself being quite dangerous; Driver's first may think that the highway section that has barrier when short distance is driven does not have too big danger, and danger is very big when driving over a long distance.Therefore, present embodiment can also provide the function that is provided with of hazard index, and the driver can be provided with the hazard index of various Dangerous Areas voluntarily at own characteristic before the navigation beginning, and the high more representative danger of hazard index is big more.
Still be that example is carried out with flow process shown in Figure 1, present embodiment also can comprise before described step 11:
Step 10, the hazard index of the various Dangerous Areas of importing in advance according to the driver sets in advance the hazard index of various Dangerous Areas in described road data model.
In described step 11, after calculating described at least one path, present embodiment further according to the Dangerous Area information that sets in advance in the described road data model, is determined Dangerous Area included on each path; According to the hazard index of the various Dangerous Areas that set in advance, add up the hazard index of each paths; According to the hazard index of each paths, select the minimum path of hazard index, and whether the prompting driver selects safest guidance path channeling conduct: after the affirmation indication that receives the driver, according to the minimum path channeling conduct of described hazard index; After the rejection indication that receives the driver, enter step 12.
Like this, by above flow process, present embodiment can be selected dangerous minimum guidance path for this driver, thereby can further improve drive safety at driver's driving ability.
In the above-mentioned flow process, can also further judge whether the departure place that calculates have only one to the path of destination: if then select this path as guidance path and enter step 17 in step 11; Otherwise, enter step 12;
Step 17, guidance path channeling conduct and process ends according to current selection, wherein, in bootup process, further according to the information of the Dangerous Area of setting up in advance in the described road data model, judge the Dangerous Area that exists on the guidance path of current selection, and arrive Dangerous Area forward direction driver the driver and point out on the Dangerous Area corresponding dangerous information.
Based on above-described road navigation method, present embodiment also correspondingly provides a kind of road navigation device, as shown in Figure 2, this road navigation device comprises path-calculating element, first interactive unit, judging unit, second interactive unit, first navigation elements and second navigation elements; Wherein,
Described path-calculating element is used for the road data model that basis is set up in advance, calculates at least one path of departure place to the destination, and triggers described first interactive unit;
Described first interactive unit, be used for triggering according to the described path-calculating element or second interactive unit, provide the information in described at least one path to the driver, and behind the guidance path that the reception driver selects, trigger described judging unit from described at least one path;
Described judging unit, be used for after the triggering that receives described first interactive unit, information according to the Dangerous Area of setting up in advance in the described road data model, whether judge on the guidance path of current selection dangerous highway section: if then point out corresponding Dangerous Area information and trigger described second interactive unit to the driver; Otherwise, trigger described first navigation elements; Here, described Dangerous Area is that driver's driving safety is existed dysgenic highway section, specifically comprises: zig zag highway section, many bends highway section, highway section, abrupt slope and have the highway section of barrier;
Described second interactive unit is used for the triggering according to described judging unit, receives and resolve the instruction of driver's input: trigger described first interactive unit when reselecting navigation path is indicated in described instruction; Otherwise, trigger described second navigation elements;
Described first navigation elements is used for the guidance path channeling conduct according to current selection;
Described second navigation elements is used for the guidance path channeling conduct according to current selection, and arrives described Dangerous Area forward direction driver the driver and point out on the described Dangerous Area corresponding dangerous information.
Preferably, road navigation device shown in Figure 2 comprises that also hazard index is provided with unit and the 3rd navigation elements; Wherein,
Described hazard index is provided with the unit, is used for the hazard index of the various Dangerous Areas imported in advance according to the driver, sets in advance the hazard index of various Dangerous Areas in described road data model;
Described path-calculating element can also be further used for according to the Dangerous Area information that sets in advance in the described road data model, determining Dangerous Area included on each path after calculating described at least one path; According to the hazard index of the various Dangerous Areas that set in advance, add up the hazard index of each paths; According to the hazard index of each paths, select the minimum path of hazard index, and whether the prompting driver selects safest guidance path channeling conduct: after the affirmation indication that receives the driver, trigger described the 3rd navigation elements; After the rejection indication that receives the driver, trigger described first interactive unit.
Described the 3rd navigation elements is used for according to the minimum path channeling conduct of described hazard index.
Preferably, above-mentioned road navigation device can also comprise a direct navigation elements, and described path-calculating element comprises a judgment sub-unit; Wherein,
Described judgment sub-unit is used to judge whether described at least one path has only one: if then select this path as guidance path and trigger described direct navigation elements; Otherwise, trigger described first interactive unit;
Described direct navigation elements, be used for guidance path channeling conduct according to current selection, and in bootup process, information according to the Dangerous Area of setting up in advance in the described road data model, judge the Dangerous Area that exists on the guidance path of current selection, and arrive Dangerous Area forward direction driver the driver and point out on the Dangerous Area corresponding dangerous information.
Preferably, described second navigation elements, can also be further used for distance between driver and described Dangerous Area reach predetermined alarm apart from the time, point out corresponding dangerous information on the described Dangerous Area by voice to the driver.
Preferably, road navigation device shown in Figure 2 can also comprise:
Dangerous Area is set up the unit, is used for according to the Dangerous Area information of gathering in advance, increases in the data structure corresponding with Dangerous Area in described road data model:
The dangerous node ID of Dangerous Area;
The road section that dangerous node connects;
The hazard types of this danger node ID correspondence;
The type of vehicle of this danger node ID correspondence;
The alarm distance of this danger node ID correspondence;
Dangerous time range on the Dangerous Area.
In sum, road navigation method that the embodiment of the invention provides and device allow the driver select the highway section that whether averts danger in the path planning stage in advance, the corresponding Dangerous Area information of advanced warning when guiding, thus improved driver's driving safety.
The above only is embodiments of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. a road navigation method is characterized in that, comprising:
-steps A 0 according to the Dangerous Area information of gathering in advance, increases in the data structure corresponding with Dangerous Area in the road data model: the dangerous node ID of Dangerous Area; The hazard types of this danger node ID correspondence; The type of vehicle of this danger node ID correspondence; The alarm distance of this danger node ID correspondence; Dangerous time range on the Dangerous Area;
Steps A, the road data model according to setting up in advance calculates at least one path of departure place to the destination;
Step B provides the information in described at least one path to the driver, and receives the guidance path that the driver selects from described at least one path;
Whether step C according to the information of the Dangerous Area of setting up in advance in the described road data model, judges on the guidance path of current selection dangerous highway section; On judging the guidance path of current selection, during dangerous highway section, then point out corresponding Dangerous Area information, execution in step D then to the driver; On judging the guidance path of current selection not during dangerous highway section, then according to the guidance path channeling conduct and the process ends of current selection;
Wherein, on judging the guidance path of current selection whether during dangerous highway section,, whether judge on the guidance path dangerous highway section further according to the type of vehicle of the type of vehicle of the current driving of driver and the Dangerous Area correspondence on the guidance path;
Step D receives and resolves the instruction of driver's input: return step B when reselecting navigation path is indicated in described instruction; Otherwise,, and arrive described Dangerous Area forward direction driver the driver and point out on the described Dangerous Area corresponding dangerous information according to the guidance path channeling conduct of current selection;
Wherein, also comprised before described steps A: the hazard index of the various Dangerous Areas of importing in advance according to the driver sets in advance the hazard index of various Dangerous Areas in described road data model;
In the described steps A, after calculating described at least one path, further, determine Dangerous Area included on each path according to the Dangerous Area information that sets in advance in the described road data model; According to the hazard index of the various Dangerous Areas that set in advance, add up the hazard index of each paths; According to the hazard index of each paths, select the minimum path of hazard index, and whether the prompting driver selects safest guidance path channeling conduct: after the affirmation indication that receives the driver, according to the minimum path channeling conduct of described hazard index; After the rejection indication that receives the driver, enter step B.
2. road navigation method as claimed in claim 1 is characterized in that, in the described steps A, judges further whether described at least one path has only one: if then select this path as guidance path and enter step e; Otherwise, enter step C;
-step e, guidance path channeling conduct and process ends according to current selection, wherein, in bootup process, further according to the information of the Dangerous Area of setting up in advance in the described road data model, judge the Dangerous Area that exists on the guidance path of current selection, and arrive Dangerous Area forward direction driver the driver and point out on the Dangerous Area corresponding dangerous information.
3. road navigation method as claimed in claim 1, it is characterized in that, describedly arrive described Dangerous Area forward direction driver the driver and point out on the described Dangerous Area corresponding dangerous information to be: the distance between driver and described Dangerous Area reach predetermined alarm apart from the time, point out on the described Dangerous Area dangerous information accordingly by voice to the driver.
4. road navigation method as claimed in claim 3 is characterized in that, described Dangerous Area is the highway section that has predetermined hazards, and described Dangerous Area specifically comprises: zig zag highway section, many bends highway section, highway section, abrupt slope and have the highway section of barrier.
5. a road navigation device is characterized in that, comprises that Dangerous Area sets up unit, path-calculating element, first interactive unit, judging unit, second interactive unit, first navigation elements and second navigation elements; Wherein,
Described Dangerous Area is set up the unit, is used for according to the Dangerous Area information of gathering in advance, increases in the data structure corresponding with Dangerous Area in described road data model: the dangerous node ID of Dangerous Area; The road section that dangerous node connects; The hazard types of this danger node ID correspondence; The type of vehicle of this danger node ID correspondence; The alarm distance of this danger node ID correspondence; Dangerous time range on the Dangerous Area;
Described path-calculating element is used for the road data model that basis is set up in advance, calculates at least one path of departure place to the destination, and triggers described first interactive unit;
Described first interactive unit, be used for triggering according to the described path-calculating element or second interactive unit, provide the information in described at least one path to the driver, and behind the guidance path that the reception driver selects, trigger described judging unit from described at least one path;
Described judging unit, be used for after the triggering that receives described first interactive unit, information according to the Dangerous Area of setting up in advance in the described road data model, whether judge on the guidance path of current selection dangerous highway section: if then point out corresponding Dangerous Area information and trigger described second interactive unit to the driver; Otherwise, trigger described first navigation elements; Wherein, on judging the guidance path of current selection whether during dangerous highway section,, whether judge on the guidance path dangerous highway section further according to the type of vehicle of the type of vehicle of the current driving of driver and the Dangerous Area correspondence on the guidance path;
Described second interactive unit is used for the triggering according to described judging unit, receives and resolve the instruction of driver's input: trigger described first interactive unit when reselecting navigation path is indicated in described instruction; Otherwise, trigger described second navigation elements;
Described first navigation elements is used for the guidance path channeling conduct according to current selection;
Described second navigation elements is used for the guidance path channeling conduct according to current selection, and arrives described Dangerous Area forward direction driver the driver and point out on the described Dangerous Area corresponding dangerous information;
Described road navigation device comprises that also hazard index is provided with unit and the 3rd navigation elements; Wherein,
Described hazard index is provided with the unit, is used for the hazard index of the various Dangerous Areas imported in advance according to the driver, sets in advance the hazard index of various Dangerous Areas in described road data model;
Described path-calculating element is further used for according to the Dangerous Area information that sets in advance in the described road data model, determining Dangerous Area included on each path after calculating described at least one path; According to the hazard index of the various Dangerous Areas that set in advance, add up the hazard index of each paths; According to the hazard index of each paths, select the minimum path of hazard index, and whether the prompting driver selects safest guidance path channeling conduct: after the affirmation indication that receives the driver, trigger described the 3rd navigation elements; After the rejection indication that receives the driver, trigger described first interactive unit.
Described the 3rd navigation elements is used for according to the minimum path channeling conduct of described hazard index.
6. road navigation device as claimed in claim 5 is characterized in that, also comprises a direct navigation elements, and described path-calculating element comprises a judgment sub-unit;
Described judgment sub-unit is used to judge whether described at least one path has only one: if then select this path as guidance path and trigger described direct navigation elements; Otherwise, trigger described first interactive unit;
Described direct navigation elements, be used for guidance path channeling conduct according to current selection, and in bootup process, information according to the Dangerous Area of setting up in advance in the described road data model, judge the Dangerous Area that exists on the guidance path of current selection, and arrive Dangerous Area forward direction driver the driver and point out on the Dangerous Area corresponding dangerous information.
7. as each described road navigation device of claim 5 to 6, it is characterized in that,
Described second navigation elements, be further used for distance between driver and described Dangerous Area reach predetermined alarm apart from the time, point out corresponding dangerous information on the described Dangerous Area by voice to the driver.
8. road navigation device as claimed in claim 7 is characterized in that, described Dangerous Area is the highway section that has predetermined hazards, and described Dangerous Area specifically comprises: zig zag highway section, many bends highway section, highway section, abrupt slope and have the highway section of barrier.
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