The invention relates to a setting and using method for changing
traffic management modes of existing crossroads. At east, west, south and north crossroads, for an example of a crossing where the vehicles run from south to north and the direction is south, there are N pieces of ascending motorways from south to north and also N pieces of descending motorways from north to south, there is a left-hand bend mark
signal in northwest and southeast, respectively, and there is a straight-run
signal light in northeast and southwest, respectively, there are two yellow cross oblique lines coated on the ground at the crossroads, there are N pieces of echelon arranged parking lines in front of the ascending motorways, there is a left-hand mark
signal light and a left-hand bend parking line in the place 30m-50m south apart from the parking line of the most inner left-hand bend motorway of the ascending motorways, it dashes out double-color yellow
solid line in front-
left direction to leave a gap, there is a yellow
oblique line coated on the descending motorways on left side of the left-hand bend parking line, there is a yellow
solid line coated in front of the N pieces of echelon arranged parking line, and there are N pieces of parking mark lines coated on the descending motorways nearby the crossroads. The other directions of the crossroads are all consistent with the setting of the south. It can solve or relieve the traffic jam of motor vehicles at the crossroads.