Panasonic(at a trade show) says they can do 'next gen GPS' with 5g. Basically better location. This could be the solution for the winter problem in self driving cars.
GNSS locations can be accurate to within a few centimeters using the right equipment as long as you have a clear view of the sky. 5G isn't going to do better, and even if it could that wouldn't be sufficient for autonomous vehicles to operate in snow.