Regina Webster & Associates, Inc.
is
pre-qualified by the following Agencies:
Illinois Department of Transportation
(IDOT)
· Plans,
Specifications & Estimates
Traffic Signals
· Studies
Traffic Studies
Signal Coordination & Timing (SCAT)
Safety Studies
· Location
& Design Studies
Rehabilitation
Reconstruction/Major Rehabilitation
Chicago Department of Transportation (CDOT)
· Category
3
Residential and Industrial Streets
· Category
6
Traffic Engineering Studies, Data Collection
and Analysis
RWA
is also pre-qualified to perform
Civil and Transportation
engineering services by the Wisconsin Department
of
Transportation
(WisDOT)
and the
Indiana Department of Transportation
(INDOT).
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Tollway
Interchange Analysis, IL 64 and I-355, Lombard, Illinois
Regina
Webster & Associates was engaged by HLR to investigate
prospective capacity improvements to Illinois Tollway interchanges.
RWA conducted an analysis for a rural tollway diamond interchange
selected by ISTHA for geometric improvements to minimize ramp queues
and prevent backup onto the tollway mainline. RWA collected traffic
data at toll plazas at on-ramps and off-ramps to determine tollway
ramp volumes and plaza station volumes, vehicle classification, and
dwell time data for peak periods. RWA input the collected data, as
well as interchange ramp and toll plaza geometry, into the VISSIM
Microsimulation model to demonstrate the existing operation. With
the prime consultant, RWA is developing recommendations for
improvements to operation, including cross-street signalized
intersection and nearby control network timing optimizations.
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