Method and system for route calculation that avoids railroad crossings
First Claim
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1. A geographic database that represents road segments, the geographic database comprising:
- data entities that represent road segments;
wherein each data entity that represents a road segment that has an at-grade railroad crossing located thereon includes data indicating the at-grade railroad crossing and the location thereof along the road segment.
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Abstract
A navigation system provides information about railroad crossing locations. A geographic database used by the navigation system includes data that indicate whether an at-grade railroad crossing is located along a road segment. Using this information, a route calculation function in the navigation system calculates a route to a destination that avoids road segments that have at-grade railroad crossings. In this way, the delays associated with waiting for a train to cross a road are avoided.
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Citations
6 Claims
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1. A geographic database that represents road segments, the geographic database comprising:
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data entities that represent road segments; wherein each data entity that represents a road segment that has an at-grade railroad crossing located thereon includes data indicating the at-grade railroad crossing and the location thereof along the road segment. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification