DETROIT The owners of the 91-year-old suspension bridge across the Detroit River asked the Michigan Department of Transportation to allow trucks carrying flammable, chemical or corrosive materials to cross the bridge. An estimated 10,000 trucks cross the Ambassador Bridge every day and bridge owners are pushing for a change to allow trucks carrying Class 3 Flammable liquids and HAZMAT Class 8 Corrosive substances to be transported over the 4-lane bridge. We dont need to be adding potential hazardous material slips onto the bridge or into the river, Chang said. His ferry is allowed to transport trucks carrying hazardous materials and admits this change would affect his business. Meantime, the Wayne County Commission unanimously voted to urge Michigan officials to block the bridge from allowing the HAZMAT to be transported.