The Cardiff Road bridge in Newport has reopened to two-way road traffic after having received essential upgrade work from Network Rail.
Changes were made due to the arrival of the new fleet of electric trains that will be running alongside the road network.
During the updates, only a single lane of traffic was available to cars while the bridge was replaced with a new structure.
This forms part of Network Rail's £40 billion Railway Upgrade Plan to electrify the South Wales Mainline. By doing this, it's hoped that train passengers will be able to enjoy the benefits of a bigger, better and more reliable railway.
Andrew Griffiths, programme director for Network Rail, said: "Electrification will provide a faster, greener, quieter, more reliable railway for passengers and improve links from south Wales to major towns and cities, including London."
Further work will take place on Cardiff Road in June to raise the bridge parapets and minimise disruption to those who use the road.