From the StarPhoenix:
Following their investigation, police determined icy roads contributed to the driver’s loss of control and ensuing collision with the centre barrier on the bridge. The grey Acura then skidded across the bridge’s eastbound lanes and on top of the guardrail before crashing off the bridge and into the river. Investigators determined that a build-up of snow and ice along the guardrail contributed to the vehicle going over the bridge.
Well done, environmentalists. Well done.