Texas Transportation Code - TRANSP § 228.052. Operation of Toll Project or System

(a) The department may enter into an agreement with one or more persons to provide, on terms approved by the department, personnel, equipment, systems, facilities, and services necessary to operate a toll project or system, including the operation of toll plazas and lanes and customer service centers and the collection of tolls.

(b) A person that enters into an agreement with the department to provide services for a customer to pay an amount on an electronic toll collection customer account at a location other than a department office may collect from the customer a service charge in addition to the amount paid on the account.

(c) The commission by rule shall set the maximum amount a person may collect as a service charge under Subsection (b), which may not exceed $3 for a payment transaction.