Authorities will be keeping a close eye on roads during the Thanksgiving long weekend, watching for the top four causes of crashes.

"Operation Impact" runs from Friday to Monday, and involves local and provincial police forces across Canada.

The blitz campaign will target a series of behaviours known to police as the "big four": speeding or aggressive driving, distracted driving, impaired driving and failing to wear a seatbelt.

"Drivers and passengers must be mindful of the critical role they play in changing dangerous driving behaviours," OPP Deputy Comm. Brad Blair said in a statement.

"The OPP knows that enforcement works and educating the public about safe driving practices is a priority."

There have been 49 fatal collisions in Toronto so far this year, compared to 31 at this time in 2014, Toronto police said.

In 2014, there were 51 collisions total, only two more than there have been as of Oct. 9, 2015.

Across the province, OPP said they've investigated 227 road deaths so far this year, and 170 of the deaths involved the "big four."

York Regional Police release 'recipe for disaster'

Police in York Region have released a page from their "cook book," highlighting the organization's "recipe for disaster."

The Thanksgiving campaign was released Friday as part of "Operation Impact."

"Don't be a turkey," York Regional Police said in the circulated document, made to look like a page of an aged cook book.

"Those hoping to spend some not-so-quality time with YRP this Thanksgiving weekend should try our Recipe for Disaster, a surefire way to endanger yourself, fellow motorists and family members alike."

The recipe includes four "steps," which are the four bad driving habits being targeted by police.

Step one is being distracted, by "ingredients" like an eBay auction closing, a holiday selfie at 84 km/h or reading the YRP recipe in the car.

Step two is aggression, brought on by things like "Grey Mazda 3 cut you off," or visiting in-laws.

Step three, seatbelt misuse, "is the mashed potatoes to your main course of recklessness," police wrote. It'll cost drivers two demerit points.

Finally, police warned against getting behind the wheel after "5 pints of pumpkin ale," or a "1/2 bottle of holiday whiskey."

Impaired driving also includes being under the influence of drugs, officers wrote.

A message at the bottom of the page reads: "Help keep our roads safe by driving responsibly this Thanksgiving weekend."

'Recipe for Disaster'