If you read the literature[1], they're regressive - less regressive than sales tax, but still regressive despite being utilized more by higher income drivers.

If you read the literature[1], they're regressive - less regressive than sales tax, but still regressive despite being utilized more by higher income drivers. https://rosap.ntl.bts.gov/view/dot/16892 https://rosap.ntl.bts.gov/view/dot/16892