
How do stoplights know when to change?
Falha ao colocar no Carrinho.
Falha ao adicionar à Lista de Desejos.
Falha ao remover da Lista de Desejos
Falha ao adicionar à Biblioteca
Falha ao seguir podcast
Falha ao parar de seguir podcast
-
Narrado por:
-
De:
Sobre este áudio
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.