Sample Video 73: Transportation 18: How Does That Work? Traffic Signal Control System
1:41
Grades: K - 12

Video Description: Learn how a city’s traffic control systems work to keep traffic flowing.

Unique Video ID: Sample Video-73**

**The unique Video ID can be used to quickly locate a single video in the ET collection. This search function is designed to let teachers assign students to watch a specific video and have only that video appear as a search result. Just click on Search and choose “By Video ID.” Then type in the Video ID as it appears above. Be sure to include the dash.

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