《天工开物·中篇·舟车》
车在行进时，如果前面遇到行人要停车让路，驾车人立即发出吆喝声，马就会停下来。
凡车行时遇前途行人应避者，则掌御者急以声呼，则群马皆止。
When the carriage was行驶, if there were pedestrians in front, the driver would shout immediately, and the horse would stop.