Class 4 Practice Results - Restart New Quiz Restart New Quiz #1. A controlled railway crossing may have A flag person. A flag person. A stop sign. A stop sign. An electrical or mechanical signaling device. An electrical or mechanical signaling device. Any of the above. Any of the above. All vehicles must stop at controlled railway crossings if signaled to do so. A controlled crossing has a flag person, stop sign, crossing gate or an electric or mechanical signaling device. Next