Drivers are experiencing major delays on two major highways in the GTA after two separate incidents on Thursday.

Westbound lanes reopened on the Gardiner Expressway after a car flipped over in the centre lane near Jameson Ave. just before 1:30 p.m. Traffic is “backed up considerably,” Toronto police said, adding there was no information on any injuries.

North of the city, two westbound lanes have reopened on Hwy. 401 between Allen Rd. and Avenue Rd., after a bus rolled over and shut down the collector lanes for several hours.

A right lane and the off ramp to Bathurst St. reopened just before 7 p.m. after a three-hour closure.

There were no passengers on board the tour bus, said Sgt. Kerry Schmidt. The bus driver suffered a broken leg in the crash.

Schmidt also said no other vehicles were involved in the rollover.

“He lost control of the bus and hit the jersey barrier and (the bus) flipped onto the side,” said Const. Ian Michael.

Michael also said the driver was ejected from the bus and slid down the highway.

Crews are working to replace a highway barrier as traffic continues to be diverted off the collector lanes via Bathurst St.