In the USA there are five amber lights along the top of the FRONT of trucks and five red lights along the BACK of trucks. I'm not sure why exactly they're there but I think it's just to indicate how tall it is. True, in this image they aren't precisely at the TOP of the truck, but the trailer is just as tall and has amber lights at the top front corners, as well as the five top rear lights.
In Europe there are two white lights at the top front corners of trucks for the same purpose, and I don't know if there are any along the back. Again they aren't precisely at the very top below, but you get the idea.
To make sure that the tires won't be stolen, I assume.
The lights on European trucks (white on the front, red on the back) are simply to indicate that it is a large vehicle in the dark. It has nothing to do with the height, but with the width of the vehicle (in Germany, lorries need the lights on the corners of the vehicle when the vehicle is 2,10m ore more wide).
Yes, it is. If the tire has some minor air leak, it keeps pumping air into the tire, so you won't get your tires flat. I don't know if it's really worth it to install one of those devices, money-wise speaking. I think it's a good option only if:
Equipment costs + installation costs + added maintenance costs < Cost of having to stop due to flat tires (time not moving: delays, overtime pay for the drivers)
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