[viraptor]

There are many cases where this could be useful. Random one: let's say you're on a motorway behind another selfdriving car. It can see something: not moving, on the road, in the distance. Your car can't because the view is blocked. If the car in front is starting to slow down, then you've got two options - slow down as well, or start overtaking.

Without the extra information, it's a completely reasonable decision to start overtaking. And then you slow down as well, after spotting the same information. So yes - V2V would help here.

[05]

> Without the extra information, it's a completely reasonable decision to start overtaking.

Only reasonable if 'defensive driving' is a curse word in your dictionary. Otherwise it makes sense to wait a bit and see if you can detect something too. BTW, Google reported radar working 'through' at least one car, it can look through the gap between the car and the road surface. And LiDAR can see through glass of a car in front, or just over its top (the sensor bump of the car in front down' cover much of you car's view when cars are separated by several car lengths).

[viraptor]

The technical word is threshold. You're saying "wait a bit" - sure. Now you waited a bit and still don't see anything - you're going to start overtaking.