The Detroit-Windsor Tunnel will remain open to motorists throughout the pre-race track setup and the 2025 Detroit Grand Prix, but there are some changes. From May 29-June 1, motorists are encouraged to show a dashboard placard to access the Tunnel. Placards are available at the Windsor and Detroit toll plazas. Traffic will be re-routed to allow motorists to enter and exit the tunnel safely without entering the race route. When heading from Windsor to Detroit, take a right turn onto Jefferson upon exiting the tunnel and head to I-375. Heading from Detroit to Windsor, the best route is also I-375 to access Jefferson Avenue and follow posted signage to reach the tunnel entrance. Motorists are encouraged to plan ahead and allow a few extra minutes for travel due to the increased traffic and security in the area. For Tunnel Bus users: From May 28 to June 1, Transit Windsor will operate a shortened route between the Transit Terminal in downtown Windsor and the Detroit Tunnel Plaza only.
