In the descriptions I&#x27;ve seen, the Google car doesn&#x27;t rely on the lane markings in normal driving. The lanes are pre-mapped and it can use any mapped landmark (including but not limited to the lane markings) to determine its position relative to the lanes.<p>The Google car also does not drive in snow AFAIK. Maybe that&#x27;s bad for you but it&#x27;s not a deal breaker for the first deployment of self driving cars as there are plenty of places where it never snows.