Four people, including a child, are dead after a head-on collision in southwest Calgary late Sunday. Calgary police say a 2011 Mercedes-Benz C350 driven by a 30-year-old man was travelling south in the northbound lanes of Stoney Trail north of 90th Avenue S.W. Advertisement AdvertisementAdvertisement AdvertisementThe occupants of the Mercedes-Benz — the driver, a woman and a child — were pronounced dead at the scene. Two minutes before the collision, police received a 911 call about a vehicle travelling the wrong way on Stoney Trail. "We received a call just before the collision about a vehicle travelling the wrong direction, south in the northbound lanes.