such as the Chevrolet Colorado, Ford F150, and Dodge Ram for their Truck Enforcement Unit. There is also a small fleet of Dodge Chargers and Chevrolet Camaros, which are mainly used as "stealth traffic patrol vehicles" (which is part of the Traffic Enforcement division). The stealth vehicles are plain white police cars with a slicktop roof and gray, reflective "HOUSTON POLICE" graphics on the side as well as on the front bumper, and hidden emergency lights that are driven by uniformed officers. The Ford Crown Victoria Police Interceptor is also used in this manner - as of late 2011 the stealth patrol vehicles are now painted black. The stealth squads have been supplemented with 14 Ford Taurus Police Interceptors in early 2014 (painted black). Solo (motorcycle) officers use Harley-Davidson motorcycles. The patrol vehicle livery, painted white with blue lettered graphics dating back to 1999 (which replaced the Columbia Blue livery last used in 1998 and retired a decade later), is being phased out for a black and white color scheme where 100 vehicles are painted from $60,000 earmarked from asset forfeiture funds (under HPD policy the previous livery is still used in service until official retirement). HPD squads are usually retired when the vehicle reaches 100,000 miles (they are not reassigned to reserve or secondary duty as with the Austin or San Antonio PD after 80,000 miles) - some squads dating over 10 model years old which are no longer used for patrol duty are usually reassigned either as bait squads (HPD will park an unmanned squad in a high crime area or illegal dumping site) or the Mobility Response Division - the older HPD fleet used by Mobility Response have been retired and replaced with Ford F150 extended cab pickup trucks from the Truck Enforcement Unit. Around 2016 the Houston Chronicle revealed that some of the older squads are still in service but the breakdown rate has increased - a 100,000 mile marked squad (or 120,000 mile unmarked vehicle) has the life expectancy of an automobile with 300,000 miles with regular maintenance. At the time HPD ordered 50 new Ford Police Interceptor Utilities for the command staff but not the mainstream vehicle fleet (the department has procured newer vehicles but the budget crunch has taken in a few new orders whilst the older squads are still operational. A budget crunch in major Texas cities is partly to blame where