The Ontario Provincial Police says drivers just aren't listening.

Despite a warning last week in anticipation of more winter weather, OPP issued a release Thursday, stating they responded to many crashes in southern Ontario involving hundreds of motor vehicles.

The collisions were due to poor weather conditions and reduced visibility.

The worst crash occurred in the westbound lanes of Highway 401 near Napanee, involving approximately 150 vehicles, including 15 tractor trailers.

"We are frustrated that, one week after issuing an important warning, motorists are failing to change their driving behaviour and adjust their driving to the conditions," the release stated. "Yesterday's storm was forecasted by meteorologists and gave motorists ample time to prepare or make alternative plans where non-essential travel was involved, so there is no valid excuse for the mayhem and the resulting injuries we saw on our highways and roads again yesterday."

The OPP urges drivers to slow down and allow for extra space between vehicles. Police also ask motorists to use full headlights in adverse weather conditions.