Volvo's Pilot Assist II in the 2017 S90 combines adaptive cruise control and lane-keeping assist for semi-autonomous driving. Fully autonomous cars are coming, but concerns ranging from regulatory issues to the handoff between machines and humans need to be addressed before drivers can let go of the wheel – and trust the technology. In the meantime, we'll likely be stuck in a middle ground of semi-autonomy between Level 2 and Level 3 over the next few years. Systems such as Tesla Autopilot, Mercedes-Benz Steering Assist and Volvo Pilot Assist II can take over part if not most of the driving task but still require human supervision – and a certain level of trust on the part of the driver. In the case of the Mercedes Steering Assist and Volvo Pilot Assist II, occasional driver intervention is required, otherwise the system deactivates.