Bicyclist & Motorists: Share the Road!

The League of American Bicyclists has an excellent succinct summary of the responsibilities of motorist and bicyclists to share the road:
Share the Road
Share the Road

Sharing the Road: Cyclists
The same laws that apply to motorists apply to cyclists
Obey all traffic control devices
Use hand signals to indicate stops and turns other users
Always Wear a Properly Fitting Helmet
Ride on the Right
Ride Predictably
Be Visible
Sharing the Road: Motorists
Drive Cautiously
Yield to Cyclists
Be Considerate
Pass with Care
Watch for Children
More detail here.