A new initiative will make it easier to plan your ride from Bar Harbour, Maine to Seattle. The American Association of State Highway and Transportation Officials are accepting applications[pdf] to designate bike lanes as part of a new nation-wide Bicycle Route System. Ideally the Feds will help fund upkeep on these trails that become part of the nationwide map. For now you can only submit bike lanes and trails that link two states or the U.S. to Canada or Mexico.
