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Comment So, where are ... (Score 1) 34

... all the V2V and V2X telematics that the experts have promised? Oh, that's right. This stuff won't work unless 100% of the traffic adopts the protocols. Poor people, say goodby to your 10 year old sedan*.

Seriously, it's just a matter of installing Opticom receivers on autonomous vehicles. Or a radar detector receiver that can handle SWS (Safety Warning System) messages. And then put transmitters in emergency vehicles.

*Basing traffic safety on V2V/V2X communications is a lost cause. Because bicycles won't have them. And homeless bums wandering aimlessly through traffic won't either. But I'm repeating myself.

Comment Re:Confused by claims (Score 1) 49

To get propulsion pretty much always requires reaction mass

Requires momentum, to be precise. To date, the easiest way to generate momentum is to throw gobs of mass* out the back end of a rocket engine. But it can also be done with solar sails, for example. Which involve photons (zero mass).

*Sorry about these esoteric technical terms.

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