(a) A state agency may not purchase or lease a vehicle designed or used primarily for the transportation of individuals, including a station wagon, that has a wheelbase longer than 113 inches or that has more than 160 SAE net horsepower. The vehicle may have a wheelbase of up to 116 inches or SAE net horsepower of up to 280 if the vehicle will be converted so that it uses compressed natural gas, liquefied natural gas, liquefied petroleum gas, methanol or methanol/gasoline blends of 85 percent or greater, ethanol or ethanol/gasoline blends of 85 percent or greater, biodiesel or biodiesel/diesel blends of 20 percent or greater, or electricity, including electricity to power a plug-in hybrid motor vehicle. This exception to the wheelbase and horsepower limitations applies to a state agency regardless of the size of the agency’s vehicle fleet.
(b) The wheelbase and horsepower limitations prescribed by Subsection (a) do not apply to the purchase or lease of:
(1) a vehicle to be used primarily for criminal law enforcement;
(2) a bus, motorcycle, pickup, van, truck, three-wheel vehicle, or tractor; or
(3) an ambulance.