The maintenance of the Birmingham tunnels has led to unexpected benefits, such as as signal timings and road markings, according to an Amey UK spokesperson.
Gerry Harris says the changes could be kept on after the tunnels reopen.
Cameras from ITV News Central went inside the St Chad's and Queensway tunnels to see the work going on there.
The A38 St Chad's and Queensway tunnels through Birmingham are now closed - and will stay closed for six weeks until September 2nd.
The ITV News Central guide to alternative transport during the Birmingham A38 tunnel closures.