On Friday, September 2nd, the United States Park Police Central District, in cooperation with the USPP Traffic Safety Unit, conducted a traffic safety checkpoint on Rock Creek Parkway. The checkpoint was operational at 11 p.m. and ran until approximately 4 a.m. Officers made 100 traffic contacts over the five-hour period. Six persons were arrested – three for DUI, one for speed in excess of 30 over the posted limit, one for failing to have an operator's permit, and one for operating an unregistered vehicle. Officers also issued 78 citations for speed violations and another ten citations for various vehicle offenses. This operation was conducted to coincide with the “Smooth Operator” program, which promotes safe driving in the National Capital Area.