Highways England in the UK is carrying out major upgrade work for the busy M4 motorway, running west from capital London. In all 11 bridges are being replaced along a 51km stretch of the M4 between London and Reading. When complete, the current hard shoulder will have been rebuilt and resurfaced to allow traffic to use it as a live lane.
The section carrying the heaviest traffic, between the M25 ring road around London and the main exit for Heathrow Airport, will be widened so that it will feature five la