VIDEO - Raised Center Medians
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I enjoy these videos by Road Guy Rob. He explains how the road structures that we use daily function in an easy to understand manner. In this video he takes on the subject of raised medians. On one hand, they prevent crashes, but on the other, they keep us from turning left where we might want to. This video explains how engineers decide how to build raised medians.

When the light changes to green, drivers who intend to turn right or left are often focused on finding a gap in vehicle traffic to take advantage of. Pedestrians in the crosswalk are often not seen and a collision is the result. Leading pedestrian intervals are a simple walk light timing change that can help prevent these incidents.