Department of Public Safety (DPS) (TX)
From The RadioReference Wiki
Texas Department of Public Safety
The Texas Dept. of Public Safety (otherwise known as DPS, Highway Patrol, or THP), is a state law enforcement agency responsible for "enforcing laws, administering regulatory programs, managing records, educating the public, and managing emergencies, both directly and through interaction with other agencies."
Currently, DPS is divided into 9 Regions, with multiple Communications Centers for each region. Recently, THP has been migrating all of its radio systems to a digital, conventional system, which is capable of linking any Comm Center in the state to any other by VoIP.