The invention relates to a flyover, in particular to a crossroad three-deck three-layer flyover. The overpass is located at a crossroad. The first-layer ground of the overpass is not provided with lanes and only allows pedestrians to pass through. The overpass has two technical schemes: the first technical scheme is that the overpass is provided with three bridge surfaces; and the second-layer bridge surface is rectangular. Six east-west lanes are arranged on the second-layer bridge floor, and the six east-west lanes are sequentially Number 9, Number 3, Number 11, Number 12, Number 4 and Number 10 lanes from north to south. The three-layer bridge surface is provided with two octagonal patterns and two staggered rectangular patterns. Six north-south lanes are arranged on the third-layer bridge floor, and from west to east, the six north-south lanes are the lanes 11, 2, 10, 9, 1 and 12 in sequence. The overpass is provided with four straight lanes, four right turning lanes, four left turning lanes and four turning lanes. The third, fourth, fifth, sixth, seventh, eighth, thirteenth, fourteenth, fifteenth and sixteenth lanes of the flyover are arranged on the second-layer bridge floor in the whole course, and the first and second lanes are arranged on the third-layer bridge floor in the whole course. And the four left turning lanes pass through the second-layer bridge floor and the third-layer bridge floor. And south-north ramps are arranged on the four left turning lanes.

本发明所述立交桥，为十字路口三个桥面三层立交桥。立交桥位于十字路口。立交桥的一层地面未设置车道，仅供行人通行。立交桥有两个技术方案，第一技术方案，立交桥有三个桥面。二层桥面形状是长方形。二层桥面上有六条东西向车道，由北向南数，依次是：9、3、11、12、4、10号车道。三层桥面是两个八边形形状图案，也是两个错位长方形图案。三层桥面上有六条南北向车道，由西向东数，依次是：11、2、10、9、1、12号车道。立交桥有四条直行车道，四条右拐弯车道，四条左拐弯车道，四条调头车道。立交桥的3、4、5、6、7、8、13、14、15、16号车道，全程在二层桥面，1、2号车道全程在三层桥面。四条左拐弯车道既经由二层桥面，又经由三层桥面。四条左拐弯车道上均有南北向坡道。