Blocking cargo: Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question Blocking cargo: Answers Should never be done. Should be done to prevent shifting of cargo. Should only be done with welded material. Explanation Cargo should be blocked to prevent it from sliding around in transit. The shifting of weight in transit can make steering and handling difficult for the driver. This questions appears in the following tests: Idaho Class A Knowledge Test Missouri Class A Knowledge Test