CLR Analytics


San Diego experiences significant traffic congestion during peak travel periods, has limited HOV and HOT lanes, and has limited transit capacity. Potential solution is to increase multi-jurisdictional and multi-agency collaboration on corridor management. The San Diego I-15 corridor was chosen as a site for Analysis, Modeling and Simulation (AMS) of Integrated Corridor Management (ICM) strategies. One strategy proposed by the study team is coordinated ramp metering control. Caltrans District 11 proposed a coordinated ramp metering algorithm based on ALINEA control logic, which is a feedback ramp metering control logic originally proposed by Prof. Markos Papageorgiou in 1990s. A specific requirement for the algorithm is that it needs to work with the existing SDRMS ramp metering system, the ramp metering system deployed in San Diego, Sacramento, Riverside-San Bernardino areas.

Engineers in CLR Analytics have accumulated profound actuated signal control knowledge through various academic and practical projects. We even developed a couple versions of actuated signal control plugins under Paramics during the last decade. The collaboration between Quadstone Paramics and CLR Analytics allows Paramics to have a actuated signal control module that meets the expectation from modelers and traffic enginneers. In this effort, CLR Analytics provided the NEMA and 170/2070 control logic and some preliminary GUI design to Quadstone Paramics for the development of the actuated signal control module. CLR Analytics also provided a few rounds of testings to make sure the logic has been implemented correctly.

CLR Analytics developed the San Diego Ramp Metering System (SDRMS) plugin for the TransModeler software, in collaboration with Caliper, the developer of TransModeler, and Cambridge Systematics. CLR Analytics reversed engineered the SDRMS control logic being used in the field and then implemented it in Transmodeler as a plugin. The plugin allows for all features of the SDRMS algorithm to be utilized including: Rate plans per signal, AM and PM timing plans, and TOD plans. This allows traffic engineers and modelers to simulate the same ramp metering control currently being used in the field and further test different settings. San Diego Ramp Metering System (SDRMS) is the most widely used ramp metering system in California. It is currently deployed in Sacramento, Fresno, San Bernardino and Riverside, and San Diego areas. SDRMS can be operated under traffic-responsive or pre-timed metering control. Time-of-day (TOD) table needs to be set in order to associate a time period with the control code.

The plugin upgrade involved the use of new API functions to replace old API functions, logic and functionality checking, and the addition of some basic graphical interface.

In addition, CLR Analytics also developed one new plugin from scratch: Truck Behavior Plugin. The plugin basically provides a modeling solution to the common facts about truck behaviors that were not included in the current Paramics software.

The agreement of this project includes that CLR Analytics needs to spend extra time to develop, maintain, and support these developed plugins with the project time periods. CLR Analytics only provides the executables, user manuals, and an example networks of the final plugins to Caltrans and all consultants working on CSMP projects. Annual maintenance and support may apply to both Caltrans and CSMP consultants.

Prime Contractor: Cambridge Systematics
Sponsor: California Department of Transportation (Caltrans 51A0350 7893-120 for I-5/SR-99 CSMP, 7893-140 for I-80/SR-51 CSMP)
Jun 2008-Apr 2010

In this project, CLR Analytics developed the Lane Management plugin for the Paramics software based on the design from DKS.

We also provided supports to the DKS team on

  • how to use various plugins developed by CLR Analytics
  • some on-call simulation modeling questions
  • a ramp metering scenario testing run.

Prime Contractor: DKS Associates and Kimley-Horn and Associates

Sponsor: Alameda County Congestion Management Agency (ACCMA)

Project Time Period: Mar 2009-Jun 2009

Traffic Operation System (TOS) is the current ramp metering system deployed in Bay area, California. Under this project, CLR Analytics upgraded the TOS ramp metering plugin from Paramics version 4 to version 6.0. The metering control logic and queue override strategy were further checked for correctness. Some Paramics UI was also added to the plugin in order for users to see ramp metering locations through Paramics graphical interface.

Prime Contractor: DKS Associates and Kimley-Horn and Associates

Sponsor: Alameda County Congestion Management Agency (ACCMA)

Project Time Period: Apr 2009-Jun 2009