It depends. You need a FasTrak Flex toll tag if you are a carpool, vanpool, motorcycle or other carpool-qualifying vehicle that will use the 101 San Mateo, 101/SR-85 Santa Clara, I-580, I-680 Contra Costa, I-880 and SR-237 express lanes. Otherwise, your Standard toll tag will work on all express lanes as well as all other FasTrak facilities.
NOTE FOR CLEAN AIR VEHICLES TRAVELING IN 101 SAN MATEO, 101/SR-85 SANTA CLARA, I-680 CONTRA COSTA, I-880 AND SR-237 EXPRESS LANES
If you are an eligible clean air vehicle (CAV) using 101 San Mateo, 101/SR-85 Santa Clara, I-680 Contra Costa, I-880 and SR-237 express lanes as a single occupant, you must have a FasTrak CAV toll tag to receive the 50% discount. Solo drivers in eligible CAVs using a FasTrak Flex or Standard FasTrak toll tag in these express lanes will be charged the full toll.
Topic: Toll Tags