Add 2 min per turn
When the software is calculating route times to determine fastest route, consider artificially adding 2 min per road change to prevent crazy use of on/off ramps or side streets which save only 30 sec of traffic. A road change doesn't actually take 2min, but it's a hassle and increases accident risk, so it should save at least that much to be worthwhile. It could be a "setting" to add 0,1,or 2 min per turn. Perhaps even 3 min per left and 1 min per right.
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Alan Whitten
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Interesting. That would jive good with all the "don't do alternate routes (side streets) if it's only going to save 5 minutes Or something configurable.