United States Department of Transportation
i
DOTD support for UTC project : development of an optimal ramp metering control strategy for I-12, [research project capsule].
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2013-10-01
[PDF-168.72 KB]
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Abstract:From June to November of 2010, the Louisiana Department of Transportation and
Development (DOTD) deployed ramp metering control, using a simple pre-timed operation
with a fixed cycle length (2 seconds of green/2 seconds of red), along a 15-mile section of I-12
in Baton Rouge, LA. Ramp metering was implemented to reduce congestion, provide a safer
merge operation at freeway entrances, and improve travel time reliability of the corridor.
A recent evaluation of the effectiveness of the ramp metering strategy was inconclusive
in determining whether the fixed time operation of the control system yielded significant
reductions in congestion along the corridor. Therefore, the study recommended further
investigation to examine the feasibility of applying dynamic ramp metering algorithms on I-12,
wherever applicable. Demand responsive and coordinated ramp metering strategies involve a
system where the signals change every few seconds in response to freeway conditions locally
or at adjacent interchanges. The signals may work as individually or in coordinated clusters to
resolve complex traffic problems and reduce congestion along the freeway. In either case, the
dynamic control of the signals is feasible through Freeway Control Regulators (algorithms) that
tend to optimize the capacity of the freeway.
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