One person suffered critical injuries in a crash on Highway 401 near Port Union Road on Sunday, Ontario Provincial Police say.

A car hit a bus before 8 a.m. in the westbound express lanes and the car caught fire following the crash.

COLLISION: <a href="https://twitter.com/hashtag/Hwy401?src=hash&ref_src=twsrc%5Etfw">#Hwy401</a> WB Express at Port Union - Emergency services on scene for vehicle fire. ^jt <a href="https://t.co/aF52QJFui6">pic.twitter.com/aF52QJFui6</a> —@OPP_GTATraffic

One person who was in the car was transported to a trauma centre by Ornge air ambulance, Schmidt said.

No one in the bus was injured, he said.

Sgt. Kerry Schmidt, spokesperson for OPP's Highway Safety Division, said ​​​​​​officers are at the scene, reconstructing the crash.

"It appears to be high speed in nature," Schmidt said.

Highway 401's westbound express traffic is being diverted to the collector lanes before Whites Road.

Another driver tasered

While investigators were closing down the highway, the driver of another vehicle drove through road pylons, almost hitting firefighters, Schmidt said.

The Scarborough man, 29, was tasered after being "non-compliant to the demands of the police," he said. He was then arrested.

The G1 licensed driver was found with open liquor in his vehicle, Schmidt said.

Police have charged the man with impaired and dangerous driving, resisting arrest, driving on a prohibited highway while on a G1 licence and breaching zero-tolerance alcohol limits, Schmidt said.

"Obviously, there is no tolerance for impaired driving at any time."