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Walnut Creek authorizes city manager to sign MOU for I‑680 ramp‑metering pilot
Summary
The City Council voted unanimously June 16 to authorize the city manager to execute a Memorandum of Understanding with Contra Costa Transportation Authority and Caltrans to implement coordinated ramp metering (a three‑year CALM demonstration plus Caltrans ARM deployments) on the I‑680 corridor, with construction expected to finish in 2028 and full operations by early 2029.
The Walnut Creek City Council on June 16 authorized the city manager to execute a Memorandum of Understanding (MOU) with the Contra Costa Transportation Authority (CCTA) and Caltrans to participate in coordinated ramp‑metering projects on the Interstate 680 corridor.
Traffic Engineer Matt Redmond introduced the item, framing the MOU as a local agreement to govern roles, responsibilities and performance measures for two parallel projects: Caltrans’ Adaptive Ramp Metering (ARM) upgrades and the CCTA‑led Coordinated Adaptive Ramp Metering (CALM) demonstration. Stephanie Hu, director of projects at the CCTA, told the council northbound I‑680 is “very congested in the PM peak period,” and said coordinated metering is a tool to smooth highway flow and reduce crash risk while discouraging diversion onto neighborhood streets.
CCTA and Caltrans staff described the technical approach: detectors and CCTV on ramps and mainline, algorithms that tune meter rates in real time, selected arterial travel‑time and delay metrics to evaluate local impacts, and an operations governance structure for quarterly reviews and a working group with local staff. Project leads said construction is expected to finish in 2028 with both systems fully operational by early 2029; the CALM piece is a three‑year demonstration meant to test coordinated algorithms and additional ramp storage improvements.
Councilmembers pressed presenters on arterial spillbacks and who would monitor local streets. CCTA and Caltrans staff said ramp queue detectors and coordinated upstream adjustments will prevent meter spillover onto city arterials; the MOU also requires monitoring of specified adjacent arterials and performance indicators including arterial travel time, travel delays, and queue length as part of the evaluation. Staff said they will use third‑party probe data for evaluation and calibrate algorithms incrementally during an initial tuning period, and promised ongoing outreach including short explanatory videos and farmer’s‑market engagement.
After additional discussion about specific local locations (including the Olympic Boulevard onramp and potential design adjustments around the city corporation yard), a councilmember moved to authorize the city manager to execute the MOU. The motion passed on a roll‑call vote with all present councilmembers recorded in favor.
What happens next: staff will sign the MOU, continue design coordination with city transportation and operations staff, and implement the monitoring and outreach described to track and mitigate any arterial impacts during the three‑year pilot.
Quote: “We have been collaborating and coordinating with all the jurisdictions along 680,” Stephanie Hu said, urging the council to view the pilot as a technology‑driven alternative to widening the freeway.
Ending: Construction work is expected to continue through 2028 with full system operation projected in early 2029; the MOU establishes performance measures and a stakeholder governance structure to evaluate impacts and address concerns during implementation.
