If you are riding a motorcycle, you may ride in Bay Area Express Lanes toll free.
I-680 Sunol Express Lanes
There are no special instructions or requirements to use express lanes if you are riding a motorcycle. If you have a FasTrak toll tag, put it in the Mylar® bag that came with the tag to avoid detection and toll collection. If you have a FasTrak Flex toll tag, set it to position 3+ prior to starting your trip.
I-580, I-680 Contra Costa and SR-237 Express Lanes
A FasTrak Flex toll tag is required for motorcycles to travel toll free in these express lanes. Set the switch on the face of the tag to position 3+ prior to starting your trip to travel toll free.
Topic: FasTrak Basics