Which will be a fiasco, as (apart from no doubt taking 2-3 years of hell to do the conversion) the moment a breakdown or accident happens things will be back to square one - worse in fact. I can’t see how the expense of a proper widening can’t be justified. As an aside I feel uncomfortable not having the hard shoulder - it’s all another example of Britain going down the toilet thanks to population increasing too fast for the infrastructure.
Details here.
https://highwaysengland.co.uk/projects/a1m-junction-6-to-junction-8-smart-motorway/
Works ok on the M42, M6 & M1...
I don’t think the M42 has permanent all lane running though, happy to be corrected if this is not the case. It was, however, the trail site for Managed Motorway, which became Smart Motorway. I spoke to an HA guy about it years ago, and he said it was phenomenally successful in terms of increasing capacity.
The highways people must have assessed the risk of breakdown with modern cars and cameras and decided the hard shoulder was a waste of space that could be used better and provide extra capacity for the minimum investment. I don't have a problem with it.
I understand that the risk assessments showed a small deterioration in safety for permanent all lane running, compared to permanent hard shoulder. That wouldn’t get through a rail risk assessment.
It seems like it. The whole M1 will be like that all the way up to Sheffield before long, and there's a massive section of the M6 between Coventry and Birmingham being "upgraded" at the moment, I bet the Rugby-Coventry section will follow.
Yet strangely a lovely gold-plated section of three-lane plus hard shoulder motorway has appeared through North Yorkshire. Perhaps they're more sensible up there!
.
I’ll take that bet about Rugby - Coventry, it’s not in any plan, and is very rarely busy.
The M1 between the M25 and Sheffield will be, after the last two bits currently under construction:
M25 to J10: 4 lane with full hard shoulder
J10 to J13: 4 lane Smart Motorway (3 lane with variable hardshoulder)
J13 to J19 (M6) 4 lane all lane running, no hard shoulder. (J13-J16 under construction now)
J19 to J21 3 lane with full hard shoulder
J21 to J21a 4 lane with intermittent hard shoulder
J21a to J23a 3 lane with full hard shoulder
J23a to J24 4 lane with full hardshoulder managed Motorway
J24 to J25 4 lane all lane running, no hard shoulder (under construction now)
J25 to J28 4 lane with intermittent hard shoulder
J28 to J35a 4 Lane all lane running, no hard shoulder (except between the M18 slip roads, and Tinsley Viaduct, which are 3 lane with permanent full hard shoulder).
No more is planned after this.
2 reasons for N Yorkshire; firstly it was conversion of the A1 to Motorway standard, effectively a new build, and secondly, that part was designed so long ago it was before all lane running was a thing.