music / performance
Dutch traffic lights make a ticking sound to help the visually impaired cross the street. The lights tick in a slow tempo when they are red, and if they tick fast the light is green.
At crossings with more than one traffic light you can hear that every light ticks at a slightly different tempo. This causes the rhythms to phase.
SRTL is a performance done by four brass / woodwind musicians playing along with the ticking of four traffic lights. They all repeat one note along with the ticking of one specific light.