LONDON, Ont. -- Highway 4 south of Exeter and Elginfield Road southwest of Lucan were closed Tuesday after separate fatal crashes.

The two-vehicle crash on Highway 4 happened shortly after 6:30 a.m. just outside of Centralia.

Initial reports suggest a northbound car had slowed or stopped to make a left turn when it was struck from behind by a northbound tractor trailer.

The driver and only occupant of the sedan was pronounced deceased at the scene. He has been identified as 75-year-old James McIntyre of Middlesex Centre.

The driver of the transport truck was treated in hospital and released.

It was still dark at the time, but Huron OPP const. Jamie Stanley says there were no other apparent environmental issues.

"From what I understand the road conditions were pretty good...the weather was good."

Huron County OPP shut down the highway in both directions between Mount Carmel Drive and Whalen Line for the investigation and clean-up. It reopened around 1 p.m.

Also around 1 p.m. a three-vehicle crash on Elginfield west of Saintsbury Road left one person dead and another injured.

Middlesex County OPP say an eastbound minivan was waiting to turn into a driveway when it was struck from behind by an eastbound sedan.

That collision sent the minivan into the westbound lanes where it was struck by a commercial truck travelling west.

The driver of the minivan was taken to hospital by air ambulance and later pronounced dead.

The driver of the sedan was transported to hospital for treatment of non-life-threatening injuries. The driver of the truck was not injured.

Elginfield was closed from Hyde Park Road to Saintsbury as police investigated.

Witnesses to either collision are asked to contact police.

- With files from CTV London's Gerry Dewan and Matt Thompson