Digital services provider Version 1 has been named as National Highways' 'strategic long-term partner for managed services and collaboration'.
The company has provided cross-cloud adoption, implementation and support services for National Highways for six years.
This latest contract lasts five years, with an option to extend for a further two, and is worth at least £47.5m.
Craig Bromage, head of infrastructure and platforms at National Highways, said: 'We were looking for a long-term partner to work with us in a modern, agile DevSecOps [development, security, and operations] approach and having the skills we need to deliver our innovative strategy to meet both current and future organisational skills.
'Version 1 has already helped us make significant progress in transforming and transitioning legacy infrastructure to our cloud offering. We are very excited to be moving into the next phase, expanding the cloud capability and modernising our ways of working as we continue to deliver and improve our service to road users, making journeys better and safer.'
Guy Hodges, director of transport at Version 1 said: 'The National Highways modern ways of working and automation of platform technologies stand it apart from other organisations. The clarity of direction and defined ways of working that it has within its infrastructure and platform teams are beyond exceptional.
'This should be applauded, and Version 1 is delighted to be part of this partnership for the next seven years.'
