Information update on November 2018: This function of Didi does not exist anymore cuz Didi has closed this function in late August 2018.
Show You How to Cut Your Didi App Taxi Cost to Half Price (Didi is the Chinese Uber and has merged with Uber China).
It applies to further distance, the further, the cheaper. You better understand some Chinese to use this function, cuz the English version does not have this function.
The English version has express and premier, express is cheaper than premier.
While you exchange the language to Chinese, then you have one more choice, it is called 顺风车 （hitchhike, not free）, the price is lower than express. If you travel 30 km, you could save half the price. By the way, this function could be to different cities, not just within one city. For instance, if you are in Shenzhen, you could take this hitchhike to Guangzhou, Huizhou, or Dongguan, or other cities you select. It is much cheaper, and more convenient compared to Bus or Train, cuz it's door to door.
You need to reserve the car 15 minutes ahead.
The shortage is that sometimes you do not get a hitchhike driver that drives in your destination, especially at night. In this case you better use express or premier, or Taxi.
