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Abstract:This project has focused on field implementation and testing of a Coordinated Ramp Metering (CRM) algorithm at California State Route 99
Northbound corridor in Sacramento between Calvine Road and the SR50 interchange after 12th Ave. It is a 9 mile long corridor with 11
onramps to which the CRM algorithm has been applied. After refining the CRM algorithm using a microscopic simulation of the test site, the
project team worked closely with Caltrans Headquarters Division of Traffic Operation and District 3 Freeway Operation for (a) finalizing the
ConOps (b) real-time data acquisition from 2070 controllers in the field and establishing correct data mapping between field detectors and the
controller in the CRM algorithm; (c) implementing the CRM algorithms as real-time code running on a PATH computer; (d) estimating
realtime traffic state parameters; (e) system integration of all software modules and hardware components; (f) conducting three weeks of dryrun
tests, two weeks of progressive switching-on, system tuning and preliminary test, and five weeks of extensive testing and data collection;
and (h) accomplishing performance analysis with PeMS data. By comparing the VMT (Vehicle Miles Travelled), VHT (Vehicle Hours
Travelled), and the ratio VMT/VHT during field tests in 2017 with data from 2016 in the same period, during the AM peak hours, VMT/VHT
was increased by 7.25% on average, which indicated traffic improvement. During the PM peak hours, VMT/VHT decreased by 0.44% on
average, which meant no traffic improvement. The reason was that the traffic was not congested most of the time in PM hours. This suggests
that the CRM algorithm tested could be more effective for congested traffic.
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