Blocking a load: 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 a load: Answers Is dangerous and should never be done. Helps to stabilize the load. Is only done with liquid cargo. Explanation Blocking and bracing are used to prevent cargo from shifting in transit. This questions appears in the following tests: Iowa Class A Knowledge Test Minnesota Class B Knowledge Test Missouri Class A Knowledge Test Nevada Class B Knowledge Test