Containers of hazardous materials must be: Question Containers of hazardous materials must be: Answers Brightly-colored. Braced to prevent movement during transportation. Made of cardboard. Explanation Containers of hazardous materials should be braced so they will not fall, slide, or bounce around during transportation. This questions appears in the following tests: Alaska HazMat Alaska HazMat Arkansas HazMat California HazMat Connecticut HazMat Idaho HazMat Kentucky Tank Maine HazMat Maine HazMat Michigan HazMat Michigan HazMat Montana HazMat North Carolina HazMat Oklahoma HazMat Rhode Island Tank South Carolina Tank Tennessee HazMat Washington HazMat Wisconsin HazMat