2024 WA CDL Practice Test: Class C - Test 4 Based on 2024 WA CDL Handbook 27. There are ____ classes of hazardous materials. A 10. B 9. C 5. D 8. Next More 27/30 Progress 0 Errors Restart Next Next Class C - Test 4 Back to Test List Class C - Test 3 Class C - Test 5 Challenge Library 12 More WA 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 44 Class C - Test 5 45 Bus - Test 46 Bus - Test 2 47 Bus - Test 3