Ely's station underpass has re-opened to traffic after four months of work turning it into single flow traffic with better access for cyclists.
Traffic lights have been installed either side of the underpass to allow one lane of traffic through at a time.
The decision to change it from two way traffic has caused some criticism from local people.
A warning system to alert drivers to the low bridge has also been put in. The bridge has been labelled as the 'most struck in Britain'.
It's the final phase of the Ely Southern Bypass project which saw the road open on the 31st October 2018.
Since then traffic has been diverted away from the station underpass while the construction work took place.
The Ely bypass aims to reduce congestion in and out of Ely via the A142 to and from Soham, well known for long delays during peak times.