Billinwoodland wrote:
You could take I5 to 20 (city of Williams) or from I5 take 80 west to Vallejo, take 37 to Lakeville drive, turn right, and this will take you into Petaluma and 101. I have traveled that road a lot. It is a good road with no problems in a 35'A pulling a toad. I think the best answer to your question though is the time of day you will be traveling in the area.
I agree with the I5 to I80 that is the way we go to Petaluma and points north all of the time. If you go that way beware of traffic around Sears Point Raceway. Hwy 37 is also a two lane road so beware of accidents, we sat for 3 hours a few weeks ago behind a jackknifed truck and two cars. Did get to talk with a lot of people though. JMO