Effects of taper length on traffic operations in construction zones. Final report.

Author(s)
Graham, J.L. & Sharp, M.C.
Year
Abstract

The study dealt with a proposed taper length formula that yields shorter tapers at design speeds below 60 mph than the existing formula, L=WS. Speed, erratic manoeuvres, conflicts and encroachment data were collected at four sites, day and night, covering a variety of design speeds and taper lengths. The analyses of the collected data do not implicate the proposed taper lengths as being more hazardous. Erratic-manoeuvre and slow-moving conflicts rates were never greater with the proposed taper than with the standard or existing taper. There was no indication that the proposed taper lengths resulted in a greater number of passenger vehicle or truck encroachments on adjacent lanes. (Author/publisher)

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Publication

Library number
B 14451
Source

Washington, D.C., U.S. Department of Transportation DOT, Federal Highway Administration FHWA, Offices of Research and Development, 1977, V + 38 p.; FHWA-RD-77-162

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