[Geowanking] Probe based mapping of road network

[Russ Nelson]

christopher.wilson at daimlerchrysler.com writes:
 > We spent a couple of years looking at this and devised a k-means approach 
 > bundling data across the direction of travel to pull out the lanes.  The 
 > data could then be grouped by lanes to derive centerlines.  Stop signs and 
 > traffic lights were easy, we never got to yields or speed limits.

In principle, you can detect yields if you have enough data and enough
GPS receivers.  If GPS-a and GPS-b are on the main and side road at
the same time, and GPS-b always yields to GPS-a, then you know you
have a yield situation.  Oh, and if cars on the side road don't always
stop, it might be a yield.

Of course, it also might be a stoplight, which throws everything off. :-)

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