A general consensus has emerged among transportation planners and engineers working with bicycle facilities on the traffic operations and design factors having the greatest effect on bicycle use. Six factors are most often cited. Each of these factors is discussed below along with the ranges of values used to differentiate levels of needs. For more information, consult Wilkinson, et. The average operating speed is more important than the posted speed limit, and better reflects local conditions.
Higher speeds have a more negative impact on perceived risk and comfort.
Traffic mix . At high speeds, the wind blast from such vehicles can create a serious risk of falls. Even at lower operating speeds, shared lane use is less compatible. All types of bicyclists prefer extra roadway width to accommodate greater separation from such vehicles. Many bicyclists will choose a different route or not ride at all where there is a regular presence of such traffic unless they are able to remove themselves several feet from these motor vehicles.