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Other than increasing capacity and monitoring, I haven't really seen that these motorways are all that smart. Even when the speed limits are below the national limit, people routinely ignore them, and cause congestion anyway. I don't see why it wasn't rolled out with more active speed enforcement.
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Nothing is going to improve until we realise we have to reduce motor traffic capacity
Yes but if more drivers kill each other by these bonkers schemes we get fewer drivers. Win (irony)
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The cheapest way to increase motorway capacity, reduce collisions and injuries, reduce fuel consumption, pollution form vehicle component wear and road surface degradation and congestion is to lower the speed limit.
And the best way to enforce it is with average speed cameras as in the road works.
If this had been taken up as an option when the smart motorway concerns were first raised we'd be there by now and have tons of spare road building money spend on segregated urban cycle facility construction.
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@Oliver Schick
One 'cheap' way of increasing motor traffic 'capacity' on existing motorways that they came up with was to turn hard shoulders into additional traffic lanes. Here's what happened:
https://www.theguardian.com/politics/2020/jan/26/uks-smart-motorways-to-be-reviewed-after-increase-in-near-misses
Nothing is going to improve until we realise we have to reduce motor traffic capacity.