Among other features, sighted passengers are able to review trip and fare information, privately pay fares with a credit card, and select tip amounts without interacting with the driver. The exclusively visual interface lacks common accessibility features for blind riders.

Read more at
http://www.accessibilitynewsinternational.com/national-federation-of-the-blind-and-four-blind-people-file-suit-against-ridecharge-inc-and-three-taxicab-companies-in-california/