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.
I use didi when I need to book a ride, but that's almost never given how ubiquitous and cheap meituan ebikes or scooters are, when subways, trains, and buses fail me.
You pay like 2 dollars and then you can ride yellow escooters for 15 cents for 20 minutes for 10 days or bicycles literally free for a month. Only works for the city you buy it in btw.
Some buses don't come up in amap btw, I have to ask around.
Transnational trains don't show up in any app, you have to book them at the station they depart from, cash only.