Seven Windsor police officers joined other officers from across the province for the Ride to Remember.
The 640-kilometre bicycle journey is a tribute to colleagues who have died in the line of duty. About 100 police officers from across the province will take part.
The ride started at 7 a.m. at the Ontario Police College in Aylmer. It ends in Ottawa, for the Canadian police memorial service on Sunday.
Five Windsor police officers have died in the line of duty since 1937.
William Donnelly is an inspector with Windsor Police and one of the local officers on the ride.
"It's to remind people that even though sometimes years have passed for some, it's important that they're not forgotten," Donnelly said. "It's our way of remembering that these are people in the public sector that have devoted their life for the public service and killed or died in the line of duty."
Donnelly will be tweeting updates along the route. He can be followed at @Insp_ WmDonnelly.