What is the number one cause of death and injury in a work zone? Question What is the number one cause of death and injury in a work zone? Answers Drivers speeding Slow drivers Animals crossing the road Explanation Speeding is the leading cause of death and injury in work zones. Use extra caution when driving near workers in a work zone. This questions appears in the following tests: Arizona Class B Knowledge Test Connecticut Class B Knowledge Test Hawaii Class A Knowledge Test Idaho Bus Louisiana Class B Knowledge Test Maine Tank Maryland Class A Knowledge Test Michigan Class B Knowledge Test Montana Tank Nevada Tank New Hampshire Class A Knowledge Test Ohio Class A Knowledge Test Vermont Class B Knowledge Test Virginia Class A Knowledge Test