2024 NC CDL Practice Test: Bus - Test Based on 2024 NC CDL Handbook 23. ABS helps you: A Count the number of students boarding the bus. B Lock up your wheels. C Keep your wheels from locking up. Next More 23/30 Progress 0 Errors Restart Next Next Bus - Test Back to Test List Class C - Test 5 Bus - Test 2 Challenge Library 12 More NC CDL Practice Tests 1 Class A - Test 1 2 Class A - Test 2 3 Class A - Test 3 4 Class A - Test 4 5 Class A - Test 5 6 Class A - Test 6 7 Class A - Test 7 8 Class A - Test 8 46 Bus - Test 2 47 Bus - Test 3