Where else can I use my FasTrak Flex toll tag? - FasTrak - Bay Area FasTrak
https://www.bayareafastrak.org/en/support/using-fastrak-flex-faq6.shtml
WEBA FasTrak Flex toll tag is similar to a standard FasTrak toll tag. You can use the FasTrak Flex toll tag anywhere in California where the FasTrak logo is displayed. In the Bay Area, a properly-set FasTrak Flex toll tag is required to receive discounted tolls when driving in Bay Area Express Lanes as a carpool, vanpool or motorcycle.
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