United States Department of Transportation
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Comparison of Two Protected-Permitted Lead-Lag Left-Turn Phasing Arrangements
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1991-05-01
[PDF-4.80 MB]
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Edition:Final Report: August, 1989 - May, 1991
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Abstract:This report documents an analysis of the operations of a special type of lead-lag left-tum phasing sequence developed and used by traffic engineers in Dallas and Richardson, Texas. This phasing, known as the Dallas phasing, is prohibited by existing standards for left-tum phasing set forth in the Manual for Uniform Traffic Control Devices (MUTCD). The objective of this research was to use field and simulation data to evaluate the operational characteristics and benefits of this type of left turn phasing arrangement. Operational data were collected at four intersections in the Dallas area that utilized the phasing. Measured and predicted stopped delays were used as the primary operational measures of comparison.
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