The final stretch of Sheffield's inner ring road opened to traffic on Monday - completing a project which began 12 years ago.
The final section links Penistone Road to the Wicker
Construction on the first phase of the project, from Sheffield Parkway to Furnival Road, began in June 1995.
Work on the latest phase, which links Penistone Road to the Wicker, began in 2004 and has cost £65m.
Sheffield City Council said the new route would generate some £700m of investment in new businesses and homes.
Council leader Jan Wilson said: "The scheme is a key part of the city centre regeneration plans and will make getting around the city centre easier for all modes of transport.
"Not only will it relieve pressure from city centre streets, but it also means the area has already attracted development, creating new jobs and investment as part of Sheffield's regeneration."