More than half of all crashes: Question More than half of all crashes: Answers Occur at speeds greater than 35 mph. Happen at night. Are caused by worn tires. Involve riders who have operated the involved motorcycle for less than six months. Explanation More than half of all motorcycle crashes involve riders with less than six months of experience on the motorcycle being used. This questions appears in the following tests: North Dakota Motorcycle Practice Test 3 Indiana Motorcycle Practice Test 11 Iowa Motorcycle Practice Test 7 Maine Motorcycle Practice Test 48 Maryland Motorcycle Practice Test 15 Michigan Motorcycle Practice Test 11 Minnesota Motorcycle Practice Test 38 New Hampshire Motorcycle Practice Test 22 New Jersey Motorcycle Practice Test 47 North Carolina Motorcycle Practice Test 23 Ohio Motorcycle Practice Test 40 Utah Motorcycle Practice Test 24 Washington Motorcycle Practice Test 3