Around 10:30 yesterday morning March 1st, there was a serious collision between a sedan and a tractor trailer on Brock Road South in Puslinch.The driver of the sedan was taken to a trauma centre by air ambulance with non-life-threatening injuries. Then, around noon, a pedestrian on Brock Road North was hit by a sedan at a road closure at the intersection of Maltby Road. The pedestrian was taken to a trauma centre with serious and potentially life-threatening injuries. The cause of the collision is being investigated. The OPP is asking anyone who witnessed the crash to call 1-888-310-1122.