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Overhead bridges (过街天桥) can often be seen in Singapore (新加坡) in places where traffic is heavy and crossing the road is not easy.

______ the help of the bridges, people can cross the roads ______. Overhead bridges are used in the ______way as zebra crossing but they are more useful as they won’t hold up the traffic. They were very helpful in ______ traffic jams in central Singapore. The only weak point may be that it is not that convenient(方便) as people have to climb up a lot of ______. This is believed especially ______ for old people. But it is still much safer than walking across the road with all the moving traffic.

The government of Singapore has spent a lot of money building many overhead bridges to help people stay safe and ______ traffic moving at the same time.