Study: San Francisco, Santa Rosa and Antioch streets among worst in nation

It costs the average driver $1,000 per year to repair and maintain cars that drive on San Francisco's bumpy streets.

That's one finding from a report by a non-profit transportation research group funded by construction businesses and unions. The group says urban streets often have cracked or broken pavement and problems with the underlying foundation.

Among cities with a population of half a million or more, the study finds San Francisco to have the worst roads. Among cities with, populations of 250,000 to 500,000 Antioch and Santa Rosa have some of the bumpiest roads.