The third day of the competition the horse and driver are required to drive an obstacle course that is 500 to 800 m long.  The course consists of up to 20 gates laid out in a        70m  x 120m area.  The gates are numbered and must be completed in order, in a specified amount of time.  The gates are set from 20 cm to     50 cm wider than the wheel width of the carriage depending on your level of competition.  This is a true test of the horses fitness, suppleness and obedience after the rigors of the marathon the day before.