"John Rowland" wrote in message
...

I would hope that the vehicle behind would start braking first, and only
when the brakes on that are known to be working would the vehicle in front
start braking.

Why? At the maximum speed of 25mph with the minimum headway of 2 seconds
there will be 73 feet between pods. The highway code gives a stopping
distance of 75 feet for cars travelling at 30mph, however 30 feet of this is
the thinking time. With an electronic control system, this thinking time
could be considerably reduced.

Of note is that the highway code recommends two second headways for cars on
the road.

http://www.highwaycode.gov.uk/09.htm#105

--
Ronnie
--
www.greatcentralrailway.com
Adjust the farmyard animals before replying