Motorists who use the Thorold Tunnel will have to find an alternate route for the next week.
The tunnel closed yesterday evening in both directions and is not slated to reopen until May 18th.
The closure is necessary so crews can switch traffic to the south tube as construction on the tunnel continues.
Other construction notes to be aware of:
QEW Toronto bound Off-ramp at Welland Ave WB will be closed from 9:30am to 2:30pm today
HWY406 Southbound at St.David's Road/Beaverdams Road and on-ramp at St.David's Road E/W will be closed from 6am until 1pm today and tomorrow
HWY58 Northbound off-ramp to HWY406 Southbound will be closed from 6am until 1pm today and tomorrow