发明名称 |
Method and system for route calculation that avoids railroad crossings |
摘要 |
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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申请公布号 |
US6751549(B1) |
申请公布日期 |
2004.06.15 |
申请号 |
US20020053257 |
申请日期 |
2002.01.17 |
申请人 |
NAVIGATION TECHNOLOGIES CORPORATION |
发明人 |
KOZAK FRANK J. |
分类号 |
G01C21/34;(IPC1-7):G01C21/30 |
主分类号 |
G01C21/34 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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