These street signs are an example of skew lines (drawn in yellow). The lines at the top of each street sign are not parallel, yet they do not intersect as they are on different planes in different directions. Street signs are used for navigation. Drivers use street signs everyday to figure out where to go. However runners, cyclers, and mail delivery people look at street signs to stay on route.
I found this image online at http://macarthurmetro.org/201006/feature
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