Overnight closures in the Windsor-Detroit Tunnel will be extended.

The corporate leader of Windsor's Transportation Services says the tunnel ceiling project won't be finished by mid-June, which was initially announced as the completion period.

Carolyn Brown tells CTV Windsor she's waiting to hear more details, but confirms the general contractor is revising the schedule for the $22-million project.

Construction crews have been working on the replacement of the 87-year-old ceiling since October, and it’s resulted in tunnel closures from 8 p.m. to 5:30 a.m. Sunday through Thursday.

Trevor Pearce, the vice president of operations for the tunnel, has said the project is necessary as the ceiling is showing signs of wear and tear due to moisture, road salt and exhaust.

Tunnel CEO Neal Belitsky is away this week, but is expected to have more information on his return.

The renovation project, funded by Windsor Detroit Borderlink Limited and American Roads, includes the replacement of the ceiling, as well as masonry, electrical work and other improvements.

This work is being funded entirely by tunnel toll revenues.

The tunnel opened in 1930 and runs beneath the surface of the Detroit River.

About 12,000 vehicles use the tunnel daily.

Canadian workers in the tunnel meanwhile have a new contract.

38 members have ratified a new three year deal, with a 70 per cent majority voting in favour of the agreement on Monday.

The deal is for toll collectors, traffic management staff, maintenance and skilled trade workers.

The new contract includes a $1,000 signing bonus and wage increases in the second and third year of the deal as well as major gains in pensions.

Unifor Local 195 president John Toth says the contract includes a monetary incentive for workers who want to retire at age 62, and carry them until old age security kicks in at age 65.