These pictures are examples of coplanar parallel lines. You know that the lines that are highlighted are never going to run into each other because they are parallel. In the stop sign, the bridge, and the picture frame you know that the lines are coplanar because they are on the same plane, or in this case on the same object. (In the stop sign the top and bottom of the sign is coplanar. In the frame the two sides/the width are coplanar.) The stop sign is used for cars when they passing, it is used to keep peace and have certain secruity. The bridge is used for cars to pass ontop and for boats to pass under wen the need to get across. The frame is use dto keep memoris whether your with your friends or family. They are used to preserve art.
I found this on: http://www.londonhotels.com/tower-bridge-hotels
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