In Rochester, I'd roll my bike out the driveway, ride through about two miles of light traffic subdivisions, and then I'd be in farmland on nice roads with minimal traffic to bike on.
It took me over ten minutes of stop and go and riding on the wrong way of a one-way street to get to the path along the Charles River. And, as this was a 40-minute ride, I practically had to turn right back around.
I think I'm going to need to ride earlier in the day, say 6 am, when there's less road traffic to contend with.
Huge thanks to Jody from Vegchic for the link on biking in Boston.