The OPP say they will be out in full force this weekend, making sure that people are driving safely on the province's 400-series highways.

In fact, police officers are already out doing safety checks, making sure people are driving at reasonable speeds, wearing seatbelts and not towing unsafe loads when they make their way to their cottages.

Last year, five people were killed in car crashes along provincial highways on the Victoria Day weekend.

OPP Sgt. Dave Woodford, of the Highway Safety Division, told CTV Toronto that warmer weather can be a deadly time of year for motorists, even though the driving conditions are better than in the winter.

"A lot of people think that a lot of the crashes happen in the winter months, when in fact, we've shown in our stats that July and August are when a lot of things happen," he said.

"There are more people on the roads, so there's a tendency to have more collisions as a result."

The OPP driving blitz will last all the way through Monday.

OPP Const. Graham Williamson, also of the Highway Safety Division, told ctvtoronto.ca that the northbound Highway 400 was already getting crowded by 2 p.m.

"It's really moving slowly, it's really dense traffic," he said.

Williamson said drivers need to leave extra time to get out of the city on Friday.

"Whatever you're packing, whether it be picnic supplies, cottage supplies, pack a huge load of patience, too, because Highway 400 and Highway 11 is going to be a pretty slow northbound route today and into tonight," he said.

Provincial police will also be targeting major waterways this weekend, looking for boaters who are drinking, driving unsafely as well as those not wearing proper personal flotation devices.

Last year, 30 people died on OPP-patrolled waterways, mostly as a result of not wearing lifejackets.

With a report from CTV Toronto's Dana Levenson and files from The Canadian Press