Response truck of the Dallas Fire Department Hazardous Materials Response Team.

From the official Dalls Fire Dept. HMRT webpage:

The Dallas Fire-Rescue Department officially formed the HazMat Response Team, (HMRT), and placed it in service on January 1, 1988 and during 2008 celebrated 20 years of service. The HMRT responds to an average of 200 HazMat incidents a year, not including local Engine / Truck runs for hydrocarbon fuel spills and natural gas leaks. (Every DFR Engine and Truck company carries enough absorbent and mitigation supplies to treat up to 40 gallons of product… Anything larger is handled by the HMRT.) Major HazMat incidents in Dallas have typically involved hydrocarbon spills (50%), natural gas leaks (15%), with the remaining 35% being biologicals, explosives, chlorine, ammonia, radiation calls, and/or other “exotics”.