California has strict rules about when motorists can use the carpool lane on a highway.

If commuters on Highway 101 in Sonoma and Marin counties are feeling a bit whipsawed these days, that’s understandable. For the second time in six months, crews for California’s transportation ...

Add Yahoo as a preferred source to see more of our stories on Google. California roads can feel surprisingly empty at times — from quiet intersections to long stretches of highway without another car ...