eightened awareness of air pollution and traffic congestion has caused communities to increasingly turn to public transit as part of the overall transportation solution. This increased attention has resulted in higher transit ridership in many communities—for example, transit ridership in Phoenix, Arizona, has increased more than 20 percent during the past year. Transportation professionals support the increased personal mobility that public transit brings, but those professionals must also deal with the resulting increase in buses on arterial streets. City traffic engineers have responded by constructing bus bays (or pull-outs) to help maintain traffic flow and safety. However, although bus bays help keep traffic moving, if improperly designed they can be detrimental to bus travel times and may lead to overall person delay for all modes combined. The challenge is thus to identify bus bay designs that efficiently move automobiles and buses, maximize traffic capacity, and improve safety at a cost that is acceptable to most city transportation budgets
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