Traffic tends to bottleneck at the corner of Sir Francis Drake Blvd. and College Avenue, due either to rush hour or College traffic. Traffic along Magnolia, on the other hand is typically quite light. By most standards, there are nop traffic problems. The main commute path is Sir Francis Drake, which can back up during rush hour.
Kentfield is a bedroom community of San Francisco and it's an excellent commute to both the City as well as the East Bay. Commuters drive, take Golden Gate Transit buses or take the Larkspur Ferry into the City, which is about a 30 minute commute drive time during commute hours--about 15 minutes in non-commute hours. Although Sir Francis Drake Blvd. bottles up some (during school drop off), there really is very little traffic in our neighborhood.