FAQs

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The system monitors the freeway and raises or lowers the toll to keep traffic flowing smoothly in the express lanes. San Mateo 101 Express Lanes use “dynamic pricing” to set the toll price. Dynamic pricing is when the price to use the lane goes up or down depending on how crowded the lane is. Overhead message signs tell drivers the price to travel to a destination in the toll lane. Tolls will be paid using FasTrak®.

All vehicles need FasTrak® or FasTrak Flex® to use the lanes.

  • 3+ person carpools, vanpools, buses, and motorcycles can use the lane for free with a properly set FasTrak Flex or FasTrak CAV toll tag.
  • 2-person carpools can receive a 50% toll discount when using a properly set FasTrak Flex or FasTrak CAV toll tag.
  • Solo Clean Air Vehicle (CAV) drivers can receive a 50% toll discount with the FasTrak CAV toll tag.
  • Solo drivers will pay full tolls with FasTrak® or FasTrak Flex®.

Before starting your trip, solo drivers must set their FasTrak Flex toll tag to the “1” position so the toll system can charge the vehicle the proper toll. Carpools with two occupants would send the toll tag to the “2” position to get a toll discount. Carpools with three or more occupants or motorcyclists must set their toll tag to the “3+” position. The “2” and “3+” settings allow eligible vehicles to use the lanes toll free or for discounted tolls. These toll tag settings also trigger beacons that CHP officers use to enforce vehicle occupancy requirements.

Cars with a valid Clean Air Vehicle decal wishing to get a toll discount will need to use a FasTrak CAV toll tag. To apply for a FasTrak CAV toll tag, visit BayAreaFasTrak.org/cleanair.

Visit GetFasTrak.com for more information about FasTrak® and how to open an account.

No. Drivers only need one toll tag in the vehicle. Standard FasTrak toll tags should be exchanged for a FasTrak Flex toll tag. If multiple toll tags are in a vehicle, the toll system may detect the additional transponder(s) and the trip may result in multiple toll charges.

You can enter or exit the US 101 Express Lanes in San Mateo County at any point.

Two-person carpools in two-seater vehicles can travel toll-free in the US 101 Express Lanes in San Mateo County. Please set your FasTrak Flex transponder in the “3+” position before driving.

The Program helps qualifying San Mateo County residents cover some of their transportation costs by offering the option of two different transportation benefits to qualified individuals: 1) A Clipper Card with a value of $100 provided annually, or 2) FasTrak® toll tag/transponder with value of $100 provided one time. Aside from these monetary benefits, the Express Lanes will reduce congestion in the 101 Corridor and improve travel times and reliability for bus riders and other Express Lanes users. For more details, go to the Community Transportation Benefits page.

The San Mateo County Express Lanes is developing  a program that will help qualifying San Mateo County residents cover some of their transportation costs, called the Community Transportation Benefits Program. For more details, go to the Community Transportation Benefits page.

US 101 Express Lanes in San Mateo County operate Monday – Friday 5am-8pm. Outside of these hours, the lanes are open to all drivers at no charge.

Click here for assistance with toll violations.