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mechanism

on Academic Word List
4
Language in use

Read the paragraph and answer the questions below.

 

The Green Wave Mechanism 

 

The city engineers are working on a mechanism that will allow traffic in the center of the city to flow more easily. They are coordinating the traffic lights so that five or six lights will operate together. This way drivers travelling at a consistent speed will have a 'green wave'. This is a set of green lights that allows drivers to travel longer distances without having to stop at a red light.The examples below illustrate the meaning of mechanism.

What are the main purposes of the 'green wave' traffic control mechanism? Choose the 2 correct answers.

to improve traffic flow in the center of the city

to ensure that people drive slowly

to reduce time spent waiting for red traffic lights