The £814m project to install a 32-mile stretch of smart motorway, between junction 3 at Hayes and junction 12 at Theale in Berkshire, was completed in December 2022.
In April 2023, the Conservative government cancelled plans for all new smart motorways following safety and cost concerns.
A National Highways spokesperson said: “Any death on our roads is one too many and our thoughts are with the family and friends of Pulvinder Dhillon following this tragic incident.
“While nothing can ever compensate for their loss, the person responsible has been found guilty of driving carelessly.”
O’Sullivan is due to be sentenced on 24 April.
