Why do some streetlights turn off when I drive under them?

Question:
Occasionally I will be driving and the streetlight that I pass will turn off. This is especially true on one particular patch of highway. My boyfriend thinks it might be to save power. Why does it happen?

Answers:

Stopping for school bus?

I concur with Rocco's answer, it sounds like a ballast problem. The ballast is part of the lamp system and serves 3 basic functions. First, it provides the proper voltage to start the lamp. Second, it keeps the lamp operating within its design parameters (for example, controlling the current). Third, the ballast adapts to the available line current that's powering the lamp. In your case, the ballast is not allowing the proper current to reach the lamp, which is why it turns off and on (if the lamp was burned out, it would stay off).

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It's not a light sensor issue, because not all of the lamps along the street have light sensors. Rather, a few lamps have light sensors, and when one is activated, it will turn on/turn off a series of lamps, not just one.

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Because you have an extra special electro-magnetic force!

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some street lights have a dusk to dawn sensor on them and the notice the light from your headlights and it makes them go off

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I know this happens in some residental neighborhoods to prevent people from hanging out outside at night. They had that in my old neighborhood. I can't explain why on a highway though. I think your bf might be right.

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Sometimes there is a light sensor on top of the streetlight that might be noticing your headlights, tricking it into thinking that it is light out, causing it to turn out a second later.

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It's coincidence. The ballast is going bad on the light. If you were to stay there & watch them you'd notice they go off & on every few minutes. Of course, you only notice it when you're driving by so naturally you assume it's 'cause of you but it's not.

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The answer is actually very simple. Since light travels in a straight line, when your car drives under the light, it may appear to turn off since the light can no longer come through the window of your car, but instead reflects off the roof...

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