Google is announcing today that they are adding biking directions in the U.S. to Google Maps. This new feature includes: step-by-step bicycling directions; bike trails outlined directly on the map; and a new "Bicycling" layer that indicates bike trails, bike lanes, and bike-friendly roads. The directions feature provides step-by-step, bike-specific routing suggestions - similar to the directions provided by our driving, walking, or public transit modes. Simply enter a start point and destination and select "Bicycling" from the drop-down menu. You will receive a route that is optimized for cycling, taking advantage of bike trails, bike lanes, and bike-friendly streets and avoiding hilly terrain whenever possible.
Visit Google to try out this new feature. Biking directions for Google Maps is currently in Beta.