I’m not a regular motorway driver, but I can’t help noticing that in the last few months new "Jersey barriers" have been installed on the M1, M62, M18, M180 and presumably other motorways further from me. What’s so special about them, and is there a programme for rolling them out everywhere, or are they just being installed in areas of special need and in road widening projects?
Also, I used to think they were pre-cast, but from the looks of some of the machines used, they seem to be cast in situ – is that right?