If you are crossing the border Sunday morning, it may be congested on the Ambassador Bridge because of the 38th annual Detroit Free Press Talmer Bank Marathon.
The Windsor-Detroit Tunnel is closed between 6:45am and 10:30am Sunday.
Executive race director Barbara Bennage says 27,684 people are signed up to run either the marathon, half-marathon or other events associated with the annual fall favourite. Of those, 2,150 of the participates are Canadians from nine provinces.
Bennage also says the Detroit-Windsor event is unique.
"There are other international marathons or runs, but we cross borders twice."
Michael Andersen of Walled Lake, Michigan won last year's marathon with a time of 2:24:54.
Riverside Dr. W from the Ambassador Bridge to Goyeau Ave., Goyeau from Riverside Dr. E to Park St. E will be closed during the marathon.