Waiting for a stoplight to turn green can be really annoying, especially when you’re running late. It would be awesome if you had a magic wand you could wave to get the light to change. But alas, such things don’t exist. But how do stoplights know when to switch colors? We asked Jerry Kotzenmacher with the Minnesota Department of Transportation to help us find the answer.


Got a nagging question that just won’t yield? Send it to us at BrainsOn.org/contact, and we’ll put you in the express lane to answersville.

Waiting for a stoplight to turn green can be really annoying, especially when you’re running late. It would be awesome if you had a magic wand you could wave to get the light to change. But alas, such things don’t exist. But how do stoplights know when to switch colors? We asked Jerry Kotzenmacher with the Minnesota Department of Transportation to help us find the answer. Got a nagging question that just won’t yield? Send it to us at <a href="https://www.brainson.org/contact">BrainsOn.org/contact</a>, and we’ll put you in the express lane to answersville.

Moment of Um is your daily answer to those questions that pop up out of nowhere and make you go… ummmmmmm. Brought to you by your friends at Brains On Universe.

Sales and Distribution by Lemonada Media https://lemonadamedia.com/  

Moment of Um is your daily answer to those questions that pop up out of nowhere and make you go&hellip; ummmmmmm. Brought to you by your friends at Brains On Universe.
Sales and Distribution by Lemonada Media <a href="https://lemonadamedia.com/" data-stringify-link="https://lemonadamedia.com/" data-sk="tooltip_parent">https://lemonadamedia.com/</a>&nbsp;&nbsp;

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