(From an old discussion with TA,  posting now after seeing the wonderful mapnificent.net).

BikeOut is a tool to show you what’s accessible by lane/other facility cycling, vs regular direct routes. It shows how the current cycle infrastructure brings some places closer, or how there are islands of difficult-to-access places now made accessible by new links. 

Here’s a demo: 


Red shows the fastest route (within 1 mile for d/town Bk, 8 mins for Union Sq). Green shows the same time/distance for the safest routes..