Watch Waymo self-driving car navigating San Francisco in heavy rain

The autonomous driving technology company Waymo appears to be making considerable progress when it comes to dealing with one of the biggest challenges facing self-driving cars — inclement weather. As Yang’s video proves, however, the San Francisco Bay area does receive variable weather, with not just rain but also frequent heavy fog. Waymo cars are also fitted with an array of lidar, radar and other sensors along with video cameras to help them navigate through traffic, adverse weather and times of low light. Are self-driving cars legal? Such Level 4 technology could be coming to UK roads soon though, albeit with a back-up driver behind the wheel.