The tower was the first innovation that used the three-coloured traffic signal and appeared first in the City of Detroit, where the first three-coloured traffic light was built at the intersection of Michigan and Woodward Avenues in 1920.
Lystårnet var den første innovation, der anvendte det tre-farvede trafiklys, og det optrådte første gang i City of Detroit, hvor det første tre-farverede trafiklys blev bygget i et vejrkyds mellem de to gader Michigan og Woodward Avenues i 1920.