These existed on the M25 for a while but they sold off the barrier moving vehicle. Some were installed installed on the M20. https://www.highwaysindustry.com/moveab ... n-the-m20/dyqik wrote: ↑Tue Jan 28, 2020 10:03 pm
The US highways that do this do it by having a string of concrete barriers that a special equipped vehicle can move from one side of the shared lanes to the other in the middle of the day/night.
The other method is to have HOV/express lanes that are separated from the main lanes in both sides, and which are only open to toll-paying/vehicles with 2 or more passengers, and which can be closed for each direction as appropriate.
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True. But on many A-road sections there is a grassy "soft shoulder" that you stand a good chance of being able to get most of your car onto. Whereas on new smart motorways with all lane running there is a crash barrier to prevent vehicles leaving the carriageway.sTeamTraen wrote: ↑Fri Jan 29, 2021 6:27 pmIn the UK you also have a lot of major trunk A-roads with the same 70mph speed limit as motorways, no hard shoulder, bicycles and milk floats allowed (IIRC - maybe only sometimes?), and vehicles joining from stop signs coming out of little side at 90 degrees.
No idea whether lack of crash barriers and an accessible "soft shoulder" (perhaps with trees to crash into) is on balance a safer alternative - but it does give you the option of leaving the carriageway.
Driving down a smart motorway this morning there was someone parked up on the grass verge at the side. Luckily there was a verge at that point.
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