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Method for creating speed profiles for digital maps

  • US 10,161,758 B2
  • Filed: 01/13/2010
  • Issued: 12/25/2018
  • Est. Priority Date: 01/16/2009
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • collecting probe data from a plurality of probes traversing a multi-lane road segment in the form of vehicular traffic flow, each probe developing a respective probe trace comprising a sequence of discrete time-stamped probe positions and having sufficient resolution to identify particular lanes traversed in the road segment;

    identifying a time span for the road segment with free flow traffic conditions;

    selecting, by a processor, probe data for the road segment collected during the identified time span;

    statistically deriving, by the processor, longitudinally distributed average speeds at positions along the road segment from the selected probe data, the longitudinally distributed average speeds being representative of a free flow speed of vehicular traffic flow along the road segment and velocity variations along a length of the road segment;

    generating, from the longitudinally distributed average speeds, an Optimal Longitudinal Speed Profile (OLSP), the OLSP being a separate speed profile that includes speeds based on the longitudinally distributed average speeds, but with smoothed transitions for accelerations and decelerations in the longitudinally distributed average speeds that improve energy efficiency with respect to the longitudinally distributed average speeds;

    associating, by the processor, the longitudinally distributed average speeds and the OLSP with the road segment; and

    storing the longitudinally distributed average speeds and the OLSP in a digital medium, the storing comprising storing unique longitudinally distributed average speeds for each lane in the road segment.

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