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SECTION I Summary Introduction Bicycling has been a form of human transportation for hundreds of years and remains a healthy and enjoyable alternative to today's primarily automobile-centric transportation patterns. Before the invention of the automobile, the League of American Wheelmen led efforts to develop and improve America's roadways, leading to our modern system of roads and highways. Bicycle safety problems have a long history in the United Stated, dating back to 1896 when a motor vehicle collided with a bicycle on a New York City Street--the first recorded automobile crash. More than a century later, safety continues to be a primary concern for modern bicyclists, with the challenges of traffic congestion, increasing distances between destinations, larger vehicles, and higher speeds. Bicyclists are recognized as legitimate roadway users. The Federal Highway Administration (FHWA) bicycle program provides guidance on numerous issues which include examples of statutory language emphasizing that bicyclists are part of the transportation system and concludes that bicyclists "should be included as a matter of routine" in the planning, design, and operation of transportation facilities (FHWA, 1999). The American Association of State Highway and Transportation Officials (AASHTO) notes that bicycle use is recognized as "a viable transportation mode," and that "All highways, except those where cyclists are legally prohibited, should be designed and constructed under the assumption that they will be used by cyclists" (AASHTO, 1999). With any roadway facility a potential bicycle facility, it is important to understand and accommodate bicyclists. The safety interests of bicyclists are sometimes in conflict with the interests of motorists. This conflict arises primarily from the substantially different characteristics of the two modes of transportation. Although bicycles can be ridden on most types of roads, the design interests of accommodating higher motor vehicle traffic volumes and speeds during peak hour congestion may create conditions that are less safe for bicyclists. This guide includes road treatments, countermeasures, and other options that support a balanced transportation system. Safety concerns can significantly influence a person's decision to bicycle for transportation or recreation. Bicyclists inherently understand that they are vulnerable road users. However, understanding bicyclist safety issues has proven difficult for engineers, planners, and facility designers. Traditionally, safety problems have been identified by analyzing police crash reports, and improvements have been made only after crashes have occurred. Such methods are not sufficient to fully understand and effectively address bicyclist safety concerns; waiting for crashes before responding with countermeasures carries a high price because many bicycle crashes tend to be severe. Bicycling has received increased attention in recent years as a mode of transportation that should be encouraged for a variety of reasons. In 1994, the U.S. Department of Transpor- tation presented the National Bicycling and Walking Study (NBWS) to the U.S. Congress, I-1