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When you travel in Hong Kong SAR, you must be careful of the traffic rules, because the traffic (交通) keeps to the left. Before crossing the street, you must look to the right and then to the left. If the traffic lights are red, the traffic must stop, and people can go across the zebra line (斑马线)．If the traffic lights turn green, the traffic can go, and people mustn't cross the road. In the morning and in the evening, when people go to or come from work, the streets are very busy.The traffic is the most dangerous.When you go somewhere by bus in Hong Kong SAR, you have to becareful, too. Always remember the traffic keeps to the left. Have a look first, or you may go the wrong way. In Hong Kong SAR, there are a lot of big buses with two floors. You'd better sit on the second floor.From there you can watch the city very well. How interesting!