What is the penalty for riding the fastrak alone without an account?

Riding the FasTrak lane alone without an account typically results in a fine or penalty fee, which can vary by jurisdiction. In California, for example, solo drivers using the FasTrak carpool lanes without a valid account may face fines that can range from $100 to $500, depending on the violation and local regulations. Additionally, they may be required to pay any tolls owed for using the express lane. It's important to check local regulations for specific penalties.