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Why Our City Needs More Bicycle Lanes

Every morning, the main roads in our city are full of cars and motorcycles that move very slowly. Many people believe that the only solution is to build wider roads. However, I believe that the city should build more bicycle lanes, for three reasons.

First, bicycle lanes reduce traffic. A study of one busy street showed that when a bicycle lane was added, nearly one in five short trips under three kilometres was made by bicycle instead of by motorcycle. Fewer motor vehicles on the road means less congestion for everyone.

Second, cycling is good for health. Doctors recommend at least thirty minutes of exercise every day, but many office workers sit for most of the day. If people cycle to work, they can exercise without needing extra time. This may also reduce medical costs in the long term.

Third, bicycle lanes make the air cleaner. Motor vehicles produce exhaust that causes breathing problems, especially for children and older people. Bicycles produce none.

Some people argue that bicycle lanes are dangerous because cyclists must share the road. This is true when there are no lanes. That is exactly why lanes with clear barriers are needed. In conclusion, building bicycle lanes is not a luxury; it is a practical investment in a faster, healthier, and cleaner city.

What is the function of the sentence "Some people argue that bicycle lanes are dangerous"?