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In April of 1987, Congress passed the Surface Transportation and Uniform Relocation Assistance Act of 1987, which allows the states to raise, without penalty, the speed limit on interstate highways outside of urbanized areas with a population of 50,000 or more. This study estimated that an increase in the rural interstate speed limit in Virginia would have both positive and negative outcomes.-The average speed traveled on the rural interstate highway system has already increased by 3.6 mph in Virginia; this is comparable to that experienced in states that have raised the speed limit. However, if the speed limit on the rural interstate highway system is raised from 55 mph to 65 mph, it is estimated that in the short run the average speed traveled on the rural interstate will increase by an additional 3 mph, from 60 mph to 63 mph. Increased speeds would be expected to result in increased stopping distances and an annual increase of between 6 and 18 fatalities and between 171 and 405 injuries. Further, injuries would likely be more severe as a result of the higher speeds traveled. If the average speed continues to increase in the long run, or if higher speeds spill over onto the urban interstate highway system or rural collector roads, then additional injuries and fatalities would be expected on those systems as well. On the other hand, the primary quantifiable benefit of the higher limit would be a savings of 1.3 million hours in business and commercial travel time. This study has also found that almost 60% of the Virginians surveyed would prefer a 65 mph speed limit to a 55 mph limit on the rural interstate highway system. Finally, because of the current speeds, the geometric design, and the accident history of the rural interstates in general, it would be possible to raise the speed limit without violating traffic engineering tenets for setting speed limits. However, if the speed limit is raised, establishing a truck speed limit differential below the limit established for passenger cars would promote increased speed variance between cars and trucks, thereby creating a more dangerous environment than if the speed limit were raised to the same level for both cars and trucks.
TRB Special Report 254 - Managing Speed: Review of Current Practices for Setting and Enforcing Speed Limits reviews practices for setting and enforcing speed limits on all types of roads and provides guidance to state and local governments on appropriate methods of setting speed limits and related enforcement strategies. Following an executive summary, the report is presented in six chapters and five appendices.
Peter Rothe's absorbing volume ex-amines one of the most important areas of modern life, the culture of the automobile. Rothe takes a problem central to everyday life--auto safety-- and reconstructs it into a means of revealing the human condition. His goal is to motivate the reader to think differently about traffic safety, and to suspend all inherited epidemiological, engineering, and psychological beliefs. Because traffic arises from the interac-tion between people, he argues that traffic safety is a social process, one that is created, formed, and changed by human interaction. Beyond Traffic Safety presents con-troversial critiques and provocative positions. It stimulates insight into the question of why traffic safety issues have become so important today. Rothe explores new social boundaries and crosses old ones. He demonstrates that interlinking social factors in a motorist's behavior reveal traffic safety as a significant facet of social behavior worthy of in-depth exploration. This may well be the first work of fundamen-tal theory in an area thus far dominated by crude empiricism. Beyond Traffic Safety describes responsibilities of drivers and ex-amines how basic trust in traffic routines sustains an orderly traffic flow. It shows how physical risks are negotiated to accommodate social ex-pectations. Part of the text is devoted to the role played by the driver's license as a form of social control, emphasiz-ing the way in which various images of licensing convey different ideas about traffic safety. Rothe focuses on the development of traffic laws and how laws affect driver behavior. He also traces the roles that discretion and tolerance play in police work. In par-ticular, the dominant traffic violation, speeding, is analyzed. Rothe looks at traffic safety in a new way by presenting it as part of a social scientific framework. He provides a basis for future exploration of this kind. Beyond Traffic Safety is an im-portant and insightful analysis for road users, traffic safety educators, policymakers, psychologists, and sociologists.
The study was prompted by the fact that on Virginia's rural interstate highways there is a three-tiered speed limit: 45 mph for school buses, 55 mph for other buses and trucks, and 65 mph for passenger vehicles. On the urban interstate system, school buses are restricted to 45 mph, but other traffic has a 55 mph speed limit. Further, the speed limit for school buses on roads other than interstate highways is 35 mph or the minimum speed limit, whichever is greater, or 45 mph if the school bus neither loads nor discharges passengers between the points of origin and destination. The study will examine the safety characteristics of the current multi-tiered speed limits and how these characteristics relate to the operation of school buses. A survey of other states revealed that 17 states other than Virginia had statutes creating speed limits for school buses lower than those for other vehicles. Generally, these states restricted the speeds of school buses to 55 mph. Three other states have administrative regulations that restrict school buses to 55 mph. However, 19 states have no special laws or regulations governing school bus speed limits. Data acquisition is still in progress for the remaining states. Research is continuing on this project, and a final report on the subject is scheduled to be completed in September 1989.