2024 CO CDL Practice Test: HazMat - Test 5 Based on 2024 CO CDL Handbook 27. On any upgrade, gravity will: A Not impact your speed. B Speed your vehicle up. C Slow your vehicle down. Next More 27/29 Progress 0 Errors Restart Next Next HazMat - Test 5 Back to Test List HazMat - Test 4 HazMat - Test 6 Challenge Library 12 More CO CDL Practice Tests 21 HazMat - Test 6 22 Passenger - Test 23 Passenger - Test 2 24 Double and Triples - Test 25 Double and Triples - Test 2 26 Double and Triples - Test 3 27 Double and Triples - Test 4 28 Double and Triples - Test 5 29 Tank - Test 30 Tank - Test 2