ORILLIA, Ont. -- Ontario Provincial Police say they saw a five-year high for the number of fatalities from collisions on roads they patrol in 2017, including a 10-year high for the number of people killed in collisions involving a transport truck.

They say 343 people died in collisions in 2017 compared to 307 in 2016, with the increase coming from driver inattention, speed and not wearing seatbelts.

The OPP say 91 people died in collisions that involved a commercial transport truck in 2017.

They say 48 motorcyclists died in 2017 -- another 10-year-high -- with 27 of those riders not at fault for the collisions.

The OPP also say 2017 was the deadliest year on record for snowmobile deaths with 29, compared to 16 the year before. Police say excessive speed, loss of control and driver inattention led the list as primary causes.

They say boating deaths reached an eight-year high with 31 people dying last year compared to 23 the year before, with the majority due to falling overboard while not wearing a life-jacket.

OPP Commissioner J.V. Hawkes said he was saddened by the statistics.

"As is the case every year, the majority of these deaths were preventable and attributed to poor driving behaviours," Hawkes said in a statement.

"Until all drivers respect and observe road, off-road and marine laws that are designed to keep us all safe, these tragic deaths will continue."