[rjsw]

One reason to have a communication system between cars is to be able to link them together in a "train" on freeways.

[closetnerd]

Nah, using visual recognition software, this can be achieved too.

[rjsw]

The cars all need to brake at the same time, a purely visual system can't manage that.

I'm just reporting what auto manufacturers have been discussing at international standards meetings.