Every day, we get in each other's way. But that doesn't mean we need to crash. Here is some advice for cyclists, walkers and drivers about how to protect yourselves and each other. Some of the suggestions come from safety experts, and some from travelers. Much of it can be found in "Safe Bicycling in the Washington Area," available from the Washington Area Bicyclist Association, 202-518-0524, or by e-mail at firstname.lastname@example.org.