I think this is why Google preferentially wanted to take me down a 45 MPH state route that runs downhill and has curves and no separation between the bike lane and vehicle traffic instead of the nice, calm, traffic-less series of roads in residential neighborhoods that was accessible with a quarter-mile detour. Those roads didn't have sidewalks or bike lanes marked on the roads, so they were totally unsafe for a cyclist. As opposed to the 45 MPH road, which is perfectly safe because it has a bike lane.
This is a great project.