Even if you didn't get stuck in the Astoria roundabout over the Labor Day weekend, you probably will some day. More accidents are reported there than any other spot in the city, Oregon Department of Transportation statistics show. The Astoria Bridge comes in second, followed by the intersection of West Marine Drive and Portway Street.

But rounding out the top four is the New Youngs Bay Bridge, where even a minor crash can cause a major traffic jam. If you're caught in one, prepare to wait for a long time. Local law enforcement agencies have no special plan in place to deal with accidents on the bridge.