FasTrak is an electronic-only toll collection system used in California allowing drivers to drive through designated “FasTrak Only” lanes paying tolls without stopping.
With the switchable FasTrak Flex, a customer has the option to travel as a toll-paying solo driver or toll-free as a carpooler. Motorists should indicate the number of occupants in their vehicle prior to starting their trip on the I-10 and I-110 ExpressLanes. FasTrak Flex transponders are portable and can be moved from one vehicle to another. Drivers with a standard (non-switchable) FasTrak transponder will always pay a toll regardless of the number of occupants in the vehicle. Drivers that want the option to travel toll-free on the Metro ExpressLanes must upgrade to the switchable FasTrak Flex, which can be used on all toll facilities in California.
FasTrak in California map