Alfalfa leaf type flyover crossing structure

Abstract

The invention discloses an alfalfa leaf type flyover crossing structure which comprises a first main trunk road and a second main trunk road, wherein the first main trunk road and the second main trunk road cross. Turn-right ramps are arranged in four quadrants formed by the first main trunk road and the second main trunk road respectively. The alfalfa leaf type flyover crossing structure further comprises four turn-left ramps, and each turn-left ramp stretches over two adjacent quadrants. Each turn-left ramp comprises a turn-left circuitous section and a turn-left annular section; the entrance of each turn-left circuitous section is communicated with the corresponding turn-right ramp where left turning vehicles are driven away, and the exit of corresponding turn-left annular section is communicated with a target lane of the left turning vehicles; each turn-left circuitous section is located on the outer side of the turn-left annular section located in the same quadrant with the turn-left circuitous section. According to the alfalfa leaf type flyover crossing structure, collector-distributor lanes do not need to be arranged; no intersecting section exists between the entrance and the exit of each turn-left ramp, and the traffic capacity of the ramps and mainlines is improved; the alfalfa leaf type flyover crossing structure is slightly lower than an alfalfa leaf type flyover crossing structure provided with collector-distributor lanes in the aspects of land occupancy, building height and project building cost.

Description

technical field [0001] The invention relates to the technical field of highway and urban road engineering, in particular to a cloverleaf-shaped three-dimensional intersection structure. Background technique [0002] Common cloverleaf interchanges are generally equipped with four circular ramps, which are used for four-way intersections with small left-turn traffic. It has the advantages of low level and low cost; because the circular left-turn ramp advances first and then exits, the distance between the entrance and the exit is relatively short, causing vehicles entering and exiting the main line to interweave, thereby affecting the traffic capacity of the main line. [0003] When the distance between the entrance and exit of the ramp is relatively close, and the vehicles entering and exiting the entrance and exit of the ramp interfere greatly with the traffic of the main line, a collecting and distributing lane can be set up to ensure the speed, smoothness and safety of the...

AI Technical Summary

Problems solved by technology

Collecting and distributing lanes generally adopt double lanes, and the connection with the main line should be treated as the entrance and exit. Acceleration and deceleration lanes should be set up. Correspondingly, the cost of project investment will be virtually increased.

Images