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Freeways in urban areas routinely experience significant traffic congestion during several peak demand hours. Construction of additional freeway lanes could solve this problem, but because of economic, political, and social constraints, this is not always feasible. Diversion of short trips from freeways to arterial streets could help solve the problem without construction of new freeway lanes. However, such diversion will occur only if the traffic speed and capacity of selected urban arterial streets can be improved significantly. The regional arterial, or super street, is proposed as a class of facility that would have the continuity, speed, and capacity characteristics to attract short and medium-length trips. Through several research efforts, design and operational guidelines for regional arterial (super) streets have been developed. These are conceptually described and evaluated in terms of significance to the success of the regional arterial concept. A case study of potential impacts of several alternative regional arterial networks for the Houston/Harris County, Texas, area is described. Within the limitations of simulation, using a large network modeling package, the alternative case study network effects are compared.