The invention relates to a flyover, in particular to a five-deck three-layer flyover at a crossroad. The overpass has five design schemes. The overpass is provided with sixteen lanes. The sixteen lanes comprise four straight lanes, four right turning lanes, four left turning lanes and four turning lanes. The overpass has three layers, and the ground of the first layer is not provided with lanes and only allows pedestrians to pass. And the second-layer bridge floor and the third-layer bridge floor are vehicle passing channels. And the second-layer bridge surface is rectangular. The third layer is provided with four bridge surfaces. The bridge floor at the northeast corner and the southwest corner is provided with two rectangular patterns, and three lanes in the east-west direction are arranged on each of the two rectangular patterns; the bridge floor at the northwest corner and the southeast corner is provided with two rectangular patterns, and three lanes in the south-north direction are arranged on each of the two rectangular patterns; the turning parts of the four left turning lanes of the flyover are arranged on the second-layer bridge floor; and the turning parts of the four turning lanes are arranged on the second-layer bridge floor. The front half parts of the four through lanes, the four left turning lanes and the four turning lanes of the flyover are arranged on the third-layer bridge floor, and the rear half parts of the four through lanes, the four left turning lanes and the four turning lanes are arranged on the second-layer bridge floor.

本发明所述立交桥，为十字路口五个桥面三层立交桥。立交桥有五个设计方案。立交桥设置十六条车道。十六条车道是：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。立交桥有三层，一层地面不设置车道，仅供行人通行。二层桥面和三层桥面为车辆通行通道。二层桥面为长方形。三层有四个桥面。东北角及西南角的桥面是两个长方形图案，上面各有三条东西走向的车道；西北角及东南角的桥面是两个长方形图案，上面各有三条南北走向的车道；立交桥的四条左拐弯车道拐弯部位在二层桥面；四条调头车道的拐弯部位在二层桥面。立交桥的四条直行车道、四条左拐弯车道、四条调头车道的前半部分，设置在三层桥面，后半部分设置在二层桥面。