General Motors and DaimlerChrysler have made contingency plans with a Detroit ferry service to move vehicles and vehicle parts across the Detroit River should the border crossings become clogged or closed due to wartime security measures, Dow Jones reported. According to Dow Jones, Gregg Ward, vice president of Detroit-Windsor Truck Ferry, said his firm has negotiated with the companies to run at full capacity - for 24 hours a day - to help keep trucking lines moving in case of an emergency.