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Method and system for route calculation that avoids railroad crossings

  • US 7,400,972 B2
  • Filed: 06/14/2004
  • Issued: 07/15/2008
  • Est. Priority Date: 01/17/2002
  • Status: Active Grant
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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