The Bay Edge Walkway from Porth Teigr to the Environment Building has reopened after improvement works have been carried out to widen the walk and cycleway to seven metres.
The development work, funded by Welsh Government and Cardiff Council will enhance the path and improve usability for up to 150,000 people who cross the Barrage every month.
Cabinet Member for Culture and Leisure, Cllr Peter Bradbury said: "The decision to expand the Bay walkway comes in response to feedback to improve the pathway, which forms part of the Wales Coast Path and Bay Trail.
"These improvements will also provide visitors with easier access to the leisure attractions along Cardiff Bay Barrage, as well as the event site for the Volvo Ocean Race, which stops in Cardiff in May 2018 for two weeks."
Cabinet Member for Strategic Planning and Transport, Cllr Caro Wild said: "Cabinet Member for Strategic Planning and Transport, Cllr Caro Wild said: "The Council is committed to improving cycling and walking infrastructure across the city and I have had very positive feedback from the public about the improvements that have been made. It's a really busy stretch with lots of people using it for leisure and commuting purposes. It's also a popular place for children to learn to cycle, as well as adjacent to our friends at Pedal Power. "