2024 SC CDL Practice Test: Class C - Test Based on 2024 SC CDL Handbook 14. On a passive railroad-highway crossing, advance warning signs will most likely be what color? A Blue. B Green. C Yellow. D Red. Next More 14/30 Progress 0 Errors Restart Next Next Class C - Test Back to Test List Tank and Hazmat - Test 2 Class C - Test 2 Challenge Library 12 More SC CDL Practice Tests 1 Class A - Test 1 2 Class A - Test 2 3 Class A - Test 3 41 Class C - Test 2 42 Class C - Test 3 43 Class C - Test 4 44 Class C - Test 5 45 Bus - Test 46 Bus - Test 2 47 Bus - Test 3