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I'm Tom. I am a pupil. I was late for school this morning. It was 8:15 when I got up this morning. I quickly ran out and got on my bike. I rode very fast. When I reached a crossing, the traffic lights were red, but 1 didn't stop my bike. A policeman stopped me, and asked me why I didn't stop. I told him I was late. He told me, "You should stop when the traffic lights are red and you can cross when the traffic lights are green. There are a lot of cars on the road. It's dangerous." And then he let me go. Safety(安全) is important. We must obey (遵守) the traffic rules at any time.