How come highway street lamp do not stay lit and "blink off" unexpectedly?

A friend of mine asked me this when visiting the northeast. I still enjoy not found an answer as to why some pole lights along the highway tend to stop working when the rest are lit as you are driving along. Are they getting overheated, or is there some other explanation?

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Answers:    Seems resembling I read somewhere that those lights turn off and on adjectives the time to save strength, but I could only find this on wikipedia

At the train of life, plentiful types of high-intensity discharge lamps exhibit a phenomenon agreed as cycling. These lamps can be started at a relatively low voltage but as they warmth up during operation, the internal gas pressure within the arc tube rises and more and more voltage is required to uphold the arc discharge. As a lamp get older, the maintain voltage for the arc eventually rises to exceed the voltage provided by the electrical ballast. As the lamp heat to this point, the arc fails and the oil lamp goes out. Eventually, near the arc extinguished, the lamp cools down again, the gas pressure surrounded by the arc tube is reduced, and the ballast can once again cause the arc to strike. The effect of this is that the storm lantern glows for a while and later goes out, repeatedly.

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Look, the ET's not love static lights, they love blinking lights and other, when they are near our Planet, they use their incredible possibilities of transforming of life and impulses to turn highway lighters within "flashing mode"...hahahahaha. Good joke ha? Problem is contained by oscillations of voltage of the current supply and this "blinking" lamps, when voltage is low, other tryin' to switch ON but because of insufficient voltage they switch OFF. Veradisca & Best Regards, Neven.

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