system
Given the following post, respond as if you're commenting on Reddit:
human
How do Google's driverless cars handle ice on roads?

I was just driving from Chicago to Nashville last night and the first 100 miles were terrible with snow and ice on the roads. How do the driverless cars handle slick roads or black ice?


I tried to look it up, but the only articles I found mention that they have a hard time with snow because they can't identify the road markers when they're covered with snow, but never mention how the cars actually handle slippery conditions.
gpt
Although driverless cars use GPS to determine where they are going they need to use a light radar (lidar) system for the fine details of the road layout.

Currently, this lidar technology doesn't work in the rain due to the different reflective properties of the road surface and so the car requires the driver to take over.  

There would be a similar issue with ice on the road, even if the car can compensate for the slippery conditions via some PID type system.