METHOD AND APPARATUS FOR ROUTE CALCULATION INVOLVING FREEWAY JUNCTION
First Claim
1. A method of route calculation for a navigation system, comprising the following steps of:
- establishing, by using a processor, a calculated route between a start point and a destination by evaluating map data of a navigation system where the calculated route includes a freeway;
examining the calculated route to detect whether there is a freeway junction, where the freeway junction is defined as a route to allow a vehicle to change from one freeway to another freeway;
examining the calculated route to detect a location of an entry to the freeway or an exit from the freeway proximate to the freeway junction;
further examining the calculated route to detect whether there is an undesired condition related to the freeway junction, entry to the freeway or exit from the freeway that may require prompt driving maneuvers of the vehicle by a driver; and
recalculating, when the undesired condition is detected, a route between the start point and the destination so that the recalculated route avoids the freeway junction related to the undesired condition.
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Accused Products
Abstract
A method and apparatus of calculating a route involving a freeway junction determines an undesired freeway junction that can pose a driving difficulty, and performs route recalculation that avoids the undesired freeway junction. A distance from a freeway entry to a freeway junction, or a number of freeway entries up to the freeway junction are used to determine the undesired freeway junction. A distance from the freeway junction to a freeway exit is also used to determine the undesired freeway junction. An intermediate point is set to recalculate a route that does not involve the freeway junction to create an overall route.
13 Citations
20 Claims
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1. A method of route calculation for a navigation system, comprising the following steps of:
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establishing, by using a processor, a calculated route between a start point and a destination by evaluating map data of a navigation system where the calculated route includes a freeway; examining the calculated route to detect whether there is a freeway junction, where the freeway junction is defined as a route to allow a vehicle to change from one freeway to another freeway; examining the calculated route to detect a location of an entry to the freeway or an exit from the freeway proximate to the freeway junction; further examining the calculated route to detect whether there is an undesired condition related to the freeway junction, entry to the freeway or exit from the freeway that may require prompt driving maneuvers of the vehicle by a driver; and recalculating, when the undesired condition is detected, a route between the start point and the destination so that the recalculated route avoids the freeway junction related to the undesired condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus of route calculation for a navigation system, comprising:
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a display configured to display thereon information concerning operations of navigation system; a storage device configured to store map data and programs for operations of navigation system; an input device configured to accept a user'"'"'s input including a start point and a destination for the navigation system; and a central processing unit configured, by executing the programs in the storage device, to conduct the following operations of; establishing a calculated route between a start point and a destination by evaluating map data of a navigation system where the calculated route includes a freeway; examining the calculated route to detect whether there is a freeway junction, where the freeway junction is defined as a route to allow a vehicle to change from one freeway to another freeway; examining the calculated route to detect a location of an entry to the freeway or an exit from the freeway proximate to the freeway junction; further examining the calculated route to detect whether there is an undesired condition related to the freeway junction, entry to the freeway or exit from the freeway that may require prompt driving maneuvers of the vehicle by a driver; and recalculating, when the undesired condition is detected, a route between the start point and the destination so that the recalculated route avoids the freeway junction related to the undesired condition. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification