This is a Olympic size swimming pool. The lane lines that are connected at each end of the pool represent the coplanar parallel lines. They are on the same plane which is the surface of the water, and are all set up to be parallel so that the lanes are evenly spaced out. A person can find a pool almost any where in a neighborhood. A lot of people swim in pools over the summer and this activity is very common throughout the summer. Also competitive swimmers use pools year round to practice.
This picture was found at: sol-sports.net
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