Google maps bike route helped me design a route to work that takes 40 minutes and while it crosses several, does not take me down any heavily traveled thoroughfares. It's all thru residential areas. Previous to that I was looking at the routes I drove, which were deathtraps for a bicyclist, and I had deemed the commute too dangerous.
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The original Google route took me down some roads I felt were to busy but by dragging the route, I ended up with a fun, albeit a few miles longer ride.