When customer states they have a hybrid/clean plate vehicle:
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"The Express Lanes are governed differently than other roads and have different rules. For instance: they do not have an exemption for hybrids [or clean fuel 
plate vehicles]."
 
"On the plus side, you can travel for free if you have three or more people in your car and have an E-ZPass Flex set to HOV mode."

"For more about the HOT statute, please look up Virginia’s Legislative Information System. For more details on how to travel toll-free on our Lanes, 
head over to www.expresslanes.com."