Navigation Device Adjusting Guidance Points for Carpool Lane Entry
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Solution Overview
Problem
Conventional navigation devices face difficulties in guiding users when changing lanes to enter or exit carpool lanes, especially when these lanes are closely located with highways or when carpool lanes are used for short distances, leading to abrupt steering or failure to change lanes in time.
Innovation Solution
A navigation device with a recommended route search unit, guidance point setting unit, and guidance information announcing unit that adjusts guidance points and information based on predetermined conditions, such as lane change difficulty and carpool lane proximity, to facilitate smoother lane changes by announcing guidance information at optimal positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the navigation device provides route guidance for entering or exiting carpool lanes, then the route guidance function is improved, but the ease of operation deteriorates when lane changes are difficult due to close proximity of exits or entrances
Solution Approach 1:
The navigation device performs preliminary actions by providing advance guidance information before the vehicle reaches the carpool lane entrance or exit. The system calculates and displays the distance to the carpool lane in advance, allowing the driver to prepare for the lane change operation beforehand, thus resolving the contradiction between providing accurate route guidance and maintaining ease of operation.
2Loss of time
If the navigation device announces guidance information at the standard guidance point position, then the guidance timing is improved, but the ease of operation deteriorates when the distance between carpool lane entrance/exit and highway entrance/exit is short
Solution Approach 1:
The navigation device changes the parameter of guidance information announcement by displaying the distance to the carpool lane entrance or exit on the display unit. This parameter change allows the driver to understand the remaining distance and adjust the timing of lane change operations accordingly, resolving the contradiction between timely guidance and ease of operation in short-distance scenarios.
3Loss of information
If the navigation device provides detailed route guidance for carpool lane usage, then the information completeness is improved, but the device complexity increases due to additional judgment conditions
Solution Approach 1:
The navigation device extracts and displays only the essential information - the distance to the carpool lane entrance or exit - from the complete route guidance data. By taking out only the most critical parameter needed for lane change operations, the system maintains information completeness for the specific task while reducing the perceived complexity for the driver.
Data Source
AI summary
Disclosed is technology for providing guidance in a manner that facilitates travel along a guidance route when there is a road which has a carpool lane. A navigation device (100) is provided with: a current-location calculation means for calculating the current location of a moving body; a recommended route search means for searching for a recommended route to a destination; a guidance-point setting means for setting a guidance point in the recommended route; and a guidance information notification means for notifying predetermined guidance information when a moving body reaches a set guidance point. When predetermined conditions are fulfilled, the guidance-point setting means sets in a road which has a carpool lane a guidance point for notifying information for guidance from said road to a branch road, before the guidance point that would be set in a road that does not have a carpool lane.