2024 CO CDL Practice Test: Class A - Test 6 Based on 2024 CO CDL Handbook 20. What is not a sign of a tire failure? A Sound B Vibration C Smoother steering Next More 20/30 Progress 0 Errors Restart Next Next Class A - Test 6 Back to Test List Class A - Test 5 Class A - Test 7 Challenge Library 12 More CO CDL Practice Tests 7 Class A - Test 7 8 Class A - Test 8 9 Class B - Test 10 Class B - Test 2 11 Class B - Test 3 12 Class B - Test 4 13 Class B - Test 5 14 Class B - Test 6 15 Class B - Test 7 16 HazMat - Test