2024 RI CDL Practice Test: Tank - Test Based on 2024 RI CDL Handbook 28. How much tread should be in every major groove of a tire that is not in front? A 1/32 B 2/32 C 4/32 Grade More 28/28 Progress 0 Errors Restart Grade Grade Tank - Test Back to Test List Double and Triples - Test 5 Tank - Test 2 Challenge Library 12 More RI CDL Practice Tests 30 Tank - Test 2 31 Tank - Test 3 32 Tank - Test 4 33 Tank - Test 5 34 Air Brakes - Test 35 All - Test 36 All - Test 2 37 All - Test 3 38 Tank and Hazmat - Test 39 Tank and Hazmat - Test 2