OTTAWA — The driver of a truck pulling two trailers laden with bales of peat moss roared past four warning signs and an oversized stop sign at highway speed just before it was struck by a bus carrying a Saskatchewan hockey team last April.

The collision at an intersection killed 16 people, most of them young players on the Humboldt Broncos, injured 13 and spread sorrow throughout Canada.

But the details of precisely what happened on April 6, 2018, only emerged on Tuesday after Jaskirat Singh Sidhu, the truck driver, pleaded guilty in a Saskatchewan court. The Canadian Broadcasting Corporation obtained a copy of a statement of facts negotiated by prosecutors and Mr. Sidhu’s lawyers.

The five page document, based on an exhaustive investigation by the Royal Canadian Mounted Police, concluded that Glen Doerksen, the driver of the bus, had tried to avoid an unavoidable collision. The bus skidded nearly 80 feet before striking the truck’s trailers. There were no skid marks from the truck.