Work to replace road signs and markings and create a revised road layout on the London-bound carriageway, near Heathrow Airport, began at 2200 GMT on Monday.

BBC: Stretch of M4 bus lane opens to all motorists

The M4 eastbound, between junctions two and three, will be closed overnight for three nights from Tuesday, and again for four nights from 22 November, to continue work on road signs and markings.

BBC: Stretch of M4 bus lane opens to all motorists

Buckinghamshire has selected sites that are "low-risk" and has added solar road studs, extra signs and road markings.

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