Smart motorways are (not) more dangerous

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Boustrophedon
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Re: Smart motorways are (not) more dangerous

Post by Boustrophedon » Sat Jan 30, 2021 11:36 am

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.
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/
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bob sterman
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Re: Smart motorways are (not) more dangerous

Post by bob sterman » Sun Jan 31, 2021 8:04 am

sTeamTraen wrote:
Fri Jan 29, 2021 6:27 pm
In 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. :o
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.

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.

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Grumble
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Re: Smart motorways are (not) more dangerous

Post by Grumble » Thu Feb 18, 2021 1:23 pm

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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