Why fatal collisions in Ontario don't always lead to Criminal Code of Canada charges

Two separate fatal collisions in Stormont, Dundas and Glengarry occurred just months apart, and once charges were laid, they were for careless driving causing death under the Highway Traffic Act.Why did the SDG OPP opt to charge the drivers deemed at fault under the provincial Highway Traffic Act (HTA) instead of laying more severe charges under the Criminal Code?It is a distinction that can be significant for families and those involved with legal proceedings. While both paths stem from a road