Removing unsafe trucks from our roadways is paramount to saving lives and ensuring extra protection for those on our roads. Our Motor Carrier Safety (MCS) Unit consists of four full-time officers plus additional supplemental officers. The Motor Carrier Safety Unit inspects commercial motor vehicles and operators to ensure both meet all federal and local requirements for safety, licensure and certification. MCS officers also investigate crashes that involve commercial motor vehicles on the roadways of Fairfax County.

The Fairfax County Police Department's Traffic Safety Section (TSS) is dedicated to enhancing roadway safety and reducing traffic-related injuries and fatalities through proactive education, outreach, and enforcement initiatives. Central to its mission is educating drivers and pedestrians on safe practices while traveling throughout Fairfax County. The section actively engages the community through presentations and hands-on demonstrations, including the use of a seatbelt convincer at local events to reinforce the importance of seatbelt use. In addition to its educational efforts, the Traffic Safety Section supports high-visibility enforcement campaigns, and various educational programs throughout Fairfax County. Through these combined efforts, the section plays a vital role in promoting a culture of safety on the county's roadways.

The Fairfax County Police Department's Crash Reconstruction Unit (CRU) investigates serious and fatal collisions to provide critical insights that support targeted safety interventions and prevention efforts. Established in 1984 with two full-time investigators and a supervisor, the unit has grown to include five full-time detectives, supplemental officers, and a supervisor. CRU detectives undergo rigorous preparation, including four weeks of advanced crash reconstruction training, and maintain their expertise through ongoing coursework covering specialized topics such as pedestrian, motorcycle, and commercial vehicle collisions. Utilizing a wide range of tools, from traditional tape measures to advanced Robotic Total Stations, detectives meticulously document crash scenes and reconstruct events to determine causation. They also analyze data from a vehicle's Airbag Control Module (ACM), often referred to as the "black box," to gather key evidence. In addition to their investigative work, CRU detectives engage with the community by delivering educational presentations to students on subjects including the dangers of impaired driving and the application of math and physics in crash analysis.