A "Walk" sign doesn't mean walk. It means wait a couple seconds. Then look both ways. In fact, just keep looking as you cross, in a group if you can. Waving your hand high above your head is a good idea.
In the D.C. area, we have the triple whammy. Back to school traffic, construction on several of our major roadways and the fact that any rain causes half of the region's drivers to lose all ability to effectively operate a motor vehicle.