New York City is one of the densest cities in the world, with millions of people squeezed into a mere 303 square miles. Although it has the world's largest subway system, traffic can still be quite bad, particularly at rush hour. The city decided that it would be a good idea to encourage more people to use bicycles. If more people rode bicycles, the roads would be less clogged with cars. Also, when you ride a bicycle, you are exercising, which makes you healthy. But how can you encourage people to ride more bikes?

What does clogged mean in this context, use context clues.
points: one point for each definition, one point for each explanation, one point for proper mechanics
One sentence

In this context, the word "clogged" refers to the roads being heavily congested or blocked with cars, making traffic flow slow or come to a halt.