 Initially, the IS 250 came with the Vehicle Stability Control (VSC) system while the IS 350 used a more advanced VDIM system which reacts sooner with less intrusive operation.A Pre-Collision System (PCS) is the first offered in the entry-luxury performance sedan market segment.National Highway Traffic Safety Administration (NHTSA) crash test results in 2008 rated the IS the maximum five stars in the Side Driver and Rollover categories, and four stars in the Frontal Driver, Frontal Passenger, and Side Rear Passenger categories.