Try Self-Service Permit Machine Before Long Queue

Try Self-Service Permit Machine Before Long Queue sounds like a micro-optimization until you are on a Didi ride through rain that turns Chengdu traffic into performance art.

A friend visiting from Shanghai who thought Chengdu was 'mild' once got locked out because the fingerprint reader hates sweaty thumbs. The fix took less time than telling the story.

Try this once: write the rule on your phone lock screen for three days. If it survives, it is yours.

Not gospel.