L&D Manual Turn Lane Storage Validation/Update : Executive Summary Report
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2012-08-01
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Edition:Executive summary report.
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Abstract:The formation of queues on a highway facility is a sign of the presence of operationally
inefficient sections of the facility. Queuing occurs at intersections in large part due to overflow
or inadequacy of turn bays, inadequate capacity, or poor signal progression. The ODOT Location
and Design (L&D) Manual Volume 1 has storage requirements for both signalized and
unsignalized intersections. Figures 401-9E and 401-10E of the L&D Manual provide the
required turn lane storage lengths which should be compared with the real world conditions to
check for adequacy of these lengths as a measure of ensuring that accesses to the turn lanes are
not blocked. In addition to the projected turn lane volume, ODOT’s methodology incorporates
both deceleration (based on the speed of the roadway) and potential blockage from the adjacent
through lane. Currently, however, there are no records whether these storage lengths computed
by the methodology put forth in this manual are valid and accurately represent the actual
conditions at intersections in Ohio. Consequently, collecting real world traffic and queue storage
data at some intersections and analyzing these data is valuable for validating and/or updating the
model ODOT is currently using. Accordingly, the purpose of this research was to collect traffic
and queue storage data at some intersections in Ohio and use the collected data to validate and/or
update the model in ODOT’s L&D Manual.
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