单选题 Overhead bridges are often found in many cities, especially in places where traffic is heavy and crossing the road is dangerous.
The purpose of building these bridges is to enable people to cross roads safely. Overhead bridges are used in very much the same way as zebra crossing. They are more efficient although less convenient because people have to climb up a long flight of steps. This is inconvenient especially to older people. When people use an overhead bridge, they don"t hold up traffic. However, when they cross a busy road using a zebra crossing, traffic is held up. Hence, many overhead bridges have been built to help people and to keep traffic moving smoothly at the same time.
For their own safety, people should be encouraged to use them instead of risking their lives by dashing across the road. Old people may find it a little difficult climbing up and down the steps, but it is still much safer than walking crossing the road with all the danger of moving traffic. Overhead bridges serve a very useful purpose. This will prevent unnecessary accidents and loss of life.

单选题 What does the author intend to tell us?

单选题 What is the advantage of overhead bridges?

单选题 What is an overhead bridge?

单选题 Overhead bridges are built ______.

单选题 According to the passage, which of the following statements is NOT true?