2024 CA DMV Practice Test 19 Based on 2024 CA Driver's Handbook 4. You should use your horn when: A Another driver makes a mistake B It may help prevent a collision C Another vehicle is in your way Next More 4/30 Progress 0 Errors Restart Next Next CA Permit Practice Test 19 Back to Test List CA Permit Practice Test 18 CA Permit Practice Test 20 Challenge Library 12 More CA DMV Practice Tests 1 CA Permit Practice Test 1 2 CA Permit Practice Test 2 3 CA Permit Practice Test 3 4 CA Permit Practice Test 4 5 CA Permit Practice Test 5 6 CA Permit Practice Test 6 7 CA Permit Practice Test 7 8 CA Permit Practice Test 8 9 CA Permit Practice Test 9 20 CA Permit Practice Test 20