What are the carpool occupancy requirements?

The high-occupancy vehicle requirement on the SR 237 Express Lanes is three or more riders (or HOV 3+). Vehicles with two riders will be eligible for a 50% toll discount with a FasTrak Flex toll tag, which is required of all vehicles to use the express lane.

Two-person carpools in two-seater vehicles can travel toll-free in the SR 237 Express Lanes and must set their FasTrak Flex toll tag in the 3+ position.