The XC60 includes traditional Volvo safety features including a whiplash protection system, side impact protection system, roll stability control, dynamic stability and traction control, inflatable curtain airbags, hill descent control (AWD only), collision warning with brake support, active bi-xenon lights (optional on some models), and patented front, side, and rear structures. The XC60 also introduced a new technology feature that Volvo has named City safety. The system is described as a driver support system with the goal of preventing or mitigating vehicle-on-vehicle collisions below ; it does so through the use of a closing velocity sensor that helps determine whether a collision is likely. Depending on the speed, if a collision is likely, the Volvo's computer system will either prepare the car to brake or automatically brake the vehicle to avoid or mitigate a rear-end collision.