抄録
IN THE PRESENT PAPER, WE DISCUSS COMPACTNESS OF A CITY WITH RESPECT TO A MEAN TRAVEL TIME WHICH IS GIVEN IN SUCH A WAY THAT THE ORIGIN POINT AND THE DISTINATION POINT OF A TRAVEL ARE DISTRIBUTED UNIFORMLY AT RANDOM IN THE THREE-DIMENSIONAL SPACE OF THE CITY. SUPPOSE THAT THE HEIGHT OF THE CITY IS h AND THE AREA OF THE CITY IS S, WE GET THE COMPACT PROPORTION OF THE MINIMUM TRAVEL TIME UNDER THE CONDITION THAT THE VOLUME OF THE CITY Sh IS CONSTANT. THE RESULT IS AS FOLLOWS: h/√S= (1/3)(vv/ vh), WHERE vv IS A VERTICAL SPEED AND vh IS A HORIZONTAL SPEED IN THE CITY.
