Question Round signs indicate: Answers No passing zones. School zones. Upcoming railroad crossings. Hospitals. Explanation Round signs warn drivers of an upcoming railroad crossing area. Drivers should use extra caution when approaching a railroad crossing. This questions appears in the following tests: Alaska Practice Test 23 District Of Columbia Practice Test 12 Florida Practice Test 2 Florida Practice Test 19 Hawaii Practice Test 6 Idaho Practice Test 5 Idaho Practice Test 23 Indiana Practice Test 11 Indiana Practice Test 21 Iowa Practice Test 7 Louisiana Practice Test 10 Louisiana Practice Test 23 Maine Practice Test 23 Massachusetts Practice Test 23 Michigan Practice Test 9 Michigan Practice Test 23 Minnesota Practice Test 18 Missouri Practice Test 8 Montana Practice Test 13 Nebraska Practice Test 9 Nevada Practice Test 8 Nevada Practice Test 15 New Hampshire Practice Test 11 New Hampshire Practice Test 24 New Jersey Practice Test 2 New Jersey Practice Test 16 North Carolina Practice Test 11 North Dakota Practice Test 5 Oregon Practice Test 6 Oregon Practice Test 14 Texas Practice Test 8 Utah Practice Test 3 Vermont Practice Test 3 Virginia Practice Test 13 Washington Practice Test 18 West Virginia Practice Test 24 Wisconsin Practice Test 24