Anyone who has spent time traveling, whether as a driver or a passenger, knows about traffic lights. After all, they play a crucial role in preventing unwanted collisions at crossroads and sidewalks. Unlike certain specific elements, confusing traffic signs The typical Red for Yellow to Green signals are quite straightforward to interpret.
Based on your location, they could vary significantly. As it happens, even though a vertical (up and down) configuration is standard in many urban and rural regions, certain areas predominantly feature traffic lights arranged horizontally (left and right).
Actually, there’s no regulation requiring traffic lights to be arranged vertically. As stated in Chapter 4D, section 4D.18 According to the U.S. Department of Transportation's (DoT) Manual on Uniform Traffic Control Devices (MUTCD), both vertical and horizontal configurations are acceptable. As long as the requirements outlined in the manual are followed, traffic lights actually work -- illuminating just one color at a time, showing green to signal it's safe to move forward, and so forth -- there isn't an issue.
A city or town does not install its traffic lights horizontally purely for aesthetic reasons, as noted by YouTuber Road Guy Rob , who reached out to the DoT of Florida, Nebraska, New Mexico, and Texas regarding this matter: This specific alignment provides several advantages. Most of these states (excluding Nebraska) have the most dangerous roads In rural areas, therefore, they must install as many traffic lights in all the crucial spots as needed.
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The Reasoning Behind The Change
Primarily, this is due to clearance issues. Trucks transport vast quantities of goods nationwide, yet their trailers tend to be quite high off the ground. This height poses risks like scraping or damaging overhead traffic signals. Mounting horizontally offers additional clearance without requiring the reduction in signal size.
Costs, also. Many contemporary signaling systems utilize a vertical pole equipped with a horizontal crossarm (with lights affixed to this crossarm). Lights positioned vertically require additional height, necessitating longer poles buried into the ground for support. In contrast, horizontally mounted lights provide greater clearance beneath them, allowing the supporting pole to remain relatively short. While the difference may seem minor, when multiplied over numerous installations—hundreds or perhaps thousands—it significantly reduces expenses related to materials like metal.
Horizontally placed lights might also be more visible under certain conditions. Consider a scenario where vertically positioned lights are located across a bridge or overpass; these could potentially be difficult to discern, or drivers might struggle to determine whether the signal is red. By rotating them, we enable installation at a lower height, thereby reducing obstructions from view.
Areas prone to strong winds see advantages with horizontal lights, as evidenced by states such as Florida and Nebraska which frequently experience gusty conditions. These fixtures attach via a metal bracket onto a metallic pole, enhancing their steadiness. This configuration aligns them parallel to the supporting arm, thereby offering greater resistance against prevailing winds.
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