Drivers fear there will be traffic chaos in north Canberra from Monday morning, when part of a busy road closes for almost four months while safety upgrades are carried out.

From 9.30am, Old Well Station Road will be shut in both directions from the Federal Highway to the Exhibition Park in Canberra  car park entry, as works on the Federal Highway intersection begin.

The road is not scheduled to reopen until August 31. Transport Canberra and City Services says the $3.2 million improvements will be coordinated with the light rail project to minimise traffic disruption.

But Anne Lewis, who regularly uses Old Well Station Road, said doing both sets of work at the same time would have the opposite effect.

"When I saw the sign saying it would be closed, I thought, 'Are you serious?'" she said.