The Harris County Toll Road Authority introduced its Prohibited Vehicle/Rapid Alert System (RAS) as a spin-off project after replacing its legacy toll enforcement infrastructure. The original system upgrade included development and/or augmentation of software applications that generate an alert directly to law enforcement whenever a vehicle from a list of top 500 prohibited vehicles passes through a tolling gantry. For years, HCTRA knew the standard toll enforcement strategy of having deputies watch out for violators was becoming less effective. The authority had introduced video tolling for large corporate accounts, and allows customers to temporarily add vehicles to existing accounts without obtaining a transponder. The system also accommodates non-revenue accounts for disabled veterans and access for unmarked emergency vehicles. The added feature makes it feasible for a deputy to locate and stop a habitual violator to issue a citation. It also targets violators who try to avoid paying their outstanding HCTRA tolls and continue using the tollway by obtaining a valid toll transponder from another regional tolling agency.