Transport secretary Chris Grayling has approved a smart motorway scheme to increase capacity on the M4 in West London and Berkshire.
The improvement to the 32-mile section of the M4 between junctions 3 (Hayes) and 12 (Reading West and Theale) will see the hard shoulder converted to a permanent running lane (All-Lane Running, ALR) and traffic flow managed by variable mandatory speed limits. Emergency refuge areas will be spaced 1.85km apart.
Some sections of the motorway currently have no hard...
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