Work on Hammersmith's flyover has now finished.
It means that motorists setting their journey planner via or near the west London overpass will not face delays caused by night-time and weekend closures.
The two-year project has sought to strengthen the 1960s-built flyover.
Transport for London (TfL) says the work means that drivers will be safe there for tens of years into the future. It should also necessitate less frequent maintenance operations, as well as fewer jams.
All approach routes should go back to normal before the autumn is out with clearance work still required on the flyover's work site, says TfL.
The work represents a segment of TfL's plan to modernise the capital's roads. The £4 billion package includes schemes to upgrade important tunnels, bridges, tunnels and junctions.
Contractors such as SSL, Freyssinet and mainly Costain have been involved in the project which fortified all but five of the flyover's 16 sections. Most of the work has taken place overnight to minimise disruption to residents, motorists and public transport users.
The first five segments were already strengthened three years ago.
Improvements include resurfacing and re-waterproofing, plus fresh drainage and 4 miles worth of tensioning cables fitted.
Copyright Press Association 2015