Two days ago, an old man who works in municipal engineering asked me: "This smart light pole screen looks very mysterious. It is installed at an intersection to avoid being hit by a car, and it is hung on a tree to avoid being struck by lightning!" "This reminds me of a car rollover case in a new district last year - the construction team installed a 55-inch large screen on a 6-meter-high street light pole. However, during debugging, they found that the driver could not see the content clearly when waiting for a red light. Today we will discuss the location selection method of this new display device.

▌Three Don’t Principles in Site Selection
The most outrageous installation I have ever seen is to put the screen on the back of a bus stop sign, euphemistically called "double-sided display." The result? People waiting for the bus look at the front, and passengers getting off the bus look at the back. Both sides can only see half of the screen. Here are the key points:
​​①Don’t install it in the blind spot when turning​ ​(If a driver looks at the screen instead of looking at the road, big trouble will happen)
​​②Avoid direct sunlight​ ​(Western sunlight will turn the screen into a "mirror")
​​③Stay away from sources of electromagnetic interference​ ​(The screen near the transformer always flashes with snowflakes)
I participated in a smart park project last year, and the construction team had to install the screen under the high-voltage line tower. Guess what? Every afternoon during the peak power consumption, the screen would vibrate as if having an epileptic fit. Later, I moved fifty meters before stopping.

▌Parameter comparison table hides great knowledge
Last week, I encountered a strange thing when I was helping a customer select models: Both suppliers said they had an IP65 protection level. During the field test, A’s screen shut down after being exposed to rain for half an hour, while B’s screen could still play videos normally after being soaked in water for two hours. Here is a reminder for novices:

▌The installation height is particular
A tourist city installed two horizontal screens on an 8-meter light pole. As a result, tourists almost hit the light pole when they looked up to look at the navigation. Later, the problem was solved by changing it to a height of 4.5 meters + a depression angle of 30 degrees. Here's the golden formula:
​​Installation height = average height of main audience × 3​​
Give a chestnut:

• Sidewalk guidance screen: 1.7 meters × 3≈5 meters
• Roadway information screen: 2.2 meters × 3 ≈ 6.6 meters (the truck driver’s perspective must be considered)
  Remember to leave 0.8-1.2 meters of maintenance space, and don’t let maintenance workers perform "high-altitude tightrope walking""

▌Content adaptation is a technical activity
Last year, a business district built an interactive light pole screen, but the ladies danced around it and cracked the touch screen. Here’s a little trivia:
​​Dynamic content accounts for ≤ 30%​​
​​Single screen stay time ≤ 15 seconds​​
​​Interaction areas should avoid a height of 50-160cm​ ​(Prevent accidental touch)
Advertising screens with face recognition are best installed at a height of more than 3 meters, which can identify people and prevent children from touching them.

▌Power supply and heat dissipation can kill people
The most deceptive design I have ever encountered is to hide the distribution box in the base of the light pole. As a result, the temperature of the screen soars to 70°C in summer, and the distribution box becomes a microwave oven. Here I will teach you how to detect earthwork:
Touch the surface of the light pole two hours after turning it on.
Temperature rise ≤ 25℃ qualified
Temperature rise ≥ 35℃ Danger
A good heat dissipation design should open convection holes in the middle of the light pole, just like installing a "breathing fan" on the screen."

▌Signal transmission anti-interference
There is an information board installed on a highway, and the construction team tried to save trouble by routing network cables and high-voltage lines through the same pipeline. As a result, the screen flashed crazily when the big car passed by, just like a disco scene. Later, I took the galvanized steel pipe alone to solve the problem. This lesson is worth 50,000 yuan!

Personal opinion at the end: Some projects now treat smart light pole screens as universal decorations, but in fact they are more like "road organs". When installed at intersections, driver sight distance must be considered, pedestrian streets must control light pollution, and scenic spots must be protected against lightning strikes. When planning next time, it is recommended to bring a piece of foam board of the same size to draw on the spot. This method is more effective than any 3D modeling!

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