Blacklisting specific roads from Google Maps/Mapquest?

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As mentioned in another answer, this functionality is not directly available in the Google Maps API. However, I’ve been thinking about it, and had a couple of work-around ideas in the “hacking it together” category. Both of these rely on version 3 of the Google Maps API.

  1. When requesting the directions, set provideRouteAlternatives to true. Loop through the alternatives. Check if that route passes through one of your roadblocks. If it does, discard that route and try the next one.

  2. For each roadblock, set up in advance one or more alternate points to route through. For example, if you want to avoid a certain bridge, identify one or more alternate bridges to use. Now, if a route passes through one of your roadblocks, add the alternate point for the for roadblock as a waypoint (with stopover set to false). Now run the directions again and they should avoid the roadblock and use the alternate.

Neither of these methods are optimal, but depending on your situation, they might work for you.

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