Beginning later this year, Caltrans will activate the signals currently being installed at the on-ramps to Highway 101 between Highway 92 in San Mateo and the San Francisco city limit, including four locations in Brisbane. Ramp metering will be activated at the Harney Avenue and Sierra Point Parkway northbound on-ramps and the Beatty Avenue and Sierra Point Parkway/Lagoon Road southbound on-ramps. The ramp metering will operate on weekdays during morning and evening commute hours. The signals will start operating in late 2013. Specific information, including the date of the ramp metering turn-on and the scheduled hours of operation will be provided before the actual start up. Caltrans will also provide contact information for concerns and questions from the public during the fine-tuning process, once the system is turned on.
Ramp metering is necessary to evenly distribute the flow of traffic onto the highway. It will be used to handle the large volume of cars that enter Highway 101 every day and aims to prevent backups and heavy traffic.