FasTrak® Transponder Requirements

Travel on the 91 Express Lanes Requires a FasTrak® Transponder


All vehicles, including carpoolers, traveling on the 91 Express Lanes must properly display a FasTrak® or FasTrak® Flex® transponder linked to a valid account. Travel without a properly mounted transponder is subject to citation by the CHP and the issuance of a toll evasion violation notice.

Express Accounts or One-Time-Toll payment accounts offered by the Toll Roads (State Routes 241, 261, 133 and 73) are not accepted on the 91 Express Lanes.

A FasTrak® transponder issued by any of the California toll operators will work on the 91 Express Lanes.

FasTrak® Transponder Mounting

To help us provide you with excellent customer service, please affix your transponder to the inside of your windshield as illustrated below. It is a violation of the California Vehicle Code to use the 91 Express Lanes without a properly mounted transponder. If you require additional adhesive strips, please contact the 91 Express Lanes Customer Service Center at 800-600-9191.

FasTrak® Transponder Mounting Instructions

  1. 1.  Clean mounting area inside of windshield with rubbing alcohol and let dry.
  2. 2.  Remove plastic tape from back of adhesive strips on FasTrak® transponder.
  3. 3.  Position FasTrak® transponder as illustrated below based on your mirror type.
  4. 4.  Press FasTrak® transponder firmly against glass.


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