That actually isn't a problem for the radar because it has 360 degree awareness. So if a car veers into your lane and you are wedged between two cars, instead of veering to the right the self driving car would slow down. So basically your argument is actually an argument FOR self driving cars. I imagine that if a self driving car is put in a situation where it cannot avoid an accident at all costs it could even manipulate the car to minimize the amount of damage that is caused.