Thursday, April 23, 2015

U.S. Route 101 in San Mateo Co-Ramp Meters Go Green April 28

State of California • Department of Transportation


Date: April 22, 2015
District: 4 - Oakland
Contact: Gidget Navarro
Phone: (510) 286-5574


U.S. Route 101 in San Mateo County
Ramp Meters to go Green April 28, 2015
Watch For New Signals at On-Ramps

San Mateo County – The California Department of Transportation (Caltrans) will activate southbound ramp metering on U.S. Route 101 in San Mateo County beginning April 28, 2015.

What is Ramp Metering?
Ramp metering is a traffic management strategy using traffic signals and accompanying equipment and techniques to improve flow on the freeway system. It is intended to improve the safety of vehicle merging.

Motorists at newly activated ramp locations may experience operational delays during the first few days of operation. Caltrans staff will monitor the metered locations and make adjustments, and then fine tune the metering operations.

Southbound Activation
Meters at 17 on-ramps will be activated on southbound U.S. 101 between the San Francisco/San Mateo County line and State Route 92.

• Beginning Tuesday, April 28, 2015 on-ramp meters will be set to solid green during commute times to alert drivers to the new driving condition.

• On Tuesday, May 5, 2015, on-ramp meters will start cycling through red and green during southbound PM peak time from 2:30 p.m. to 8:00 p.m.

• On Tuesday, May 12, 2015, on-ramp meters will start cycling during southbound AM peak time from 6:00 a.m. to 10:00 a.m.

Drivers entering U.S. Route 101 where on-ramp meters are activated should stop at red and wait until the metering light turns green to enter U.S. Route 101. Caltrans will monitor traffic conditions and operate ramp meters as appropriate.

Additional Information: All on-ramps will operate at “1 car per green” except for one freeway to freeway connector ramp which will meter and operate at “2 cars per green”. The freeway connector is the eastbound State Route 92 to southbound U.S Route 101 Connector.

Following activation, Caltrans will monitor ramp metering vehicle activity and optimize systems as needed. In addition, ramp meters could be subject to time changes based on monitoring results.

For more information, go to our new Caltrans U.S. Route 101 San Mateo County Ramp Metering webpage at:

The Ramp Metering Information Line is: 510-286-4531. Or follow us on Twitter at:
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