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Mobility Impacts from Improvements to an Arterial Street
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1990-09-01
[PDF-2.68 MB]
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Edition:Final Report
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Abstract:The Texas State Department of Highways and Public Transportation is exploring methods of providing additional roadway capacity for major traffic movements. One method identified is to increase the capacity of the arterial street system. Streets with the potential of serving an enhanced role could be improved to operate at high speeds and a high level of service yet would not be required to satisfy the strict access control and right-of-way needs of a freeway. Strategic arterial was the term selected to describe this new street category. The mobility impacts from improvements to an existing arterial street (US 90A in Houston) and to conceptual corridors were evaluated using computer simulation. Transyt-7F was the computer program used to evaluate the case study improvements that ranged from a do-nothing alternative to providing grade separations at all major intersections. For the conceptual corridor, improvements evaluated included prohibiting left turns, changing the orientation of a grade-separated structure, and modifying the number of signals per mile. The primary measure of effectiveness used to describe the mobility impacts was average through speed. At-grade improvements (e.g., adding lanes or prohibiting left turns) to the existing arterial showed limited increases in through speed due to the highly congested nature of the case study area in the year 2000. Grade-separated improvements were needed to cause significant increases in travel speeds.
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