 7.52 now, WTOP. A woman walking along a stretch of highway in Fairfax County was hit and killed by a car earlier this morning. Fairfax County police say it happened around 4 a.m. on Leesburg Pike and Downey Drive by Great Falls. The driver of the car remained on the scene and police are investigating. Meanwhile, more red light cameras are being installed in Arlington this month. WTOP's Scott Gelman reports it's part of a push to keep drivers and pedestrians safe.