Nice so you don't have to floor it to make a yellow or Kickstart your air-cooled motorcycle when a long red turns green.
The timing is off by 3 seconds to stop people from going just before it turns green. So people go 4 seconds early.
TIL most of the US is "tier 5".
Cities with < 1m population: San Francisco, San Jose, Portland, Seattle, Boston, Nashville, Denver, OKC. Austin is just 1m, Chicago 3m, LA 4, NYC 8.5.
Having ridden high speed rail through some of China, it was quite staggering to see the urban scale. And the sharp transition from high rise to farmland.