In his article on May 26, writer John Rogers proclaimed that Los Angeles recently became the first major city in the world with synchronized traffic lights.
Chicago has had synchronized traffic lights for decades. It was probably easier for Chicago to do this, since the city is totally flat and laid out mainly in a grid with north-south and east-west streets.
I remember late one night, about 40 years ago, when there was almost no traffic, that I, driving at exactly 30 miles per hour, traveled almost from one end of the city going west to the other without stopping. I had green lights all the way.