> What do you do when you can't see the lines on the road? Or when cars are suddenly four abreast on a three lane highway? Or things like the especially treache

> What do you do when you can't see the lines on the road? Or when cars are suddenly four abreast on a three lane highway? Or things like the especially treacherous black ice. Indeed, these things are also quite tricky for human drivers (Winter is a windfall for body shops!).