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Method and apparatus for detecting and correcting freeway-ramp-freeway situation in calculated route

  • US 20100217512A1
  • Filed: 02/24/2009
  • Published: 08/26/2010
  • Est. Priority Date: 02/24/2009
  • Status: Active Grant
First Claim
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1. A method of correcting a particular situation in a calculated route between a start point to a destination for a navigation system, comprising the following steps of:

  • establishing a calculated route between the start point and the destination where the calculated route includes a freeway;

    examining the calculated route from one end to another end (forward direction) to detect whether there is a first point where the calculated route exits a freeway;

    further examining the calculated route in the forward direction to detect whether there is a second point where the calculated route enters a freeway;

    evaluating map data associated with the calculated route to determine whether the freeway exited at the first point and the freeway entered at the second point are the same freeway;

    determining that a freeway-ramp-freeway situation exists in the calculated route when the freeway exited and the freeway entered are the same where the freeway-ramp-freeway situation is defined as a situation where a calculated route exits a freeway and immediately enters the same freeway; and

    replacing road segments of the calculated route between the first point and the second point constituting the freeway-ramp-freeway situation with freeway segments between the first point and the second point, thereby changing the freeway-ramp-freeway situation to an all-freeway situation.

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