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In 603 AD, Chang 'an was not what it used to be. At that time, there were rut marks everywhere, because the streets were covered with mud, so as soon as the carriage passed, deep rut marks came out. But what drivers like most is to make the rut marks on the street more uneven, so they never take the road that others have taken, so pedestrians on the road will also see the horse run left first and then right, just like now. But you may ask, where did that man go? Anyone who has been to Chang 'an in 603 BC knows that the design of Chang 'an at that time was actually quite good, just like the current urban design, which divided lanes and sidewalks. As the name implies, there are all kinds of wooden carts running in the driveway, some are horse-drawn and some are pushed. Just because of the unfavorable municipal construction, Chang 'an Avenue has become a mud street in just a few years, full of mud. So that in the end only the carriage ran on it. Those unicycles and bicycles that need to be pushed out of the historical stage were split by their owners with axes and used as dry wood for heating and cooking in winter. At that time, the sidewalk was actually very wide ...