Research on non-weaved double three-limb interchange

When two freeway or highway cross or parallel, it is possible to adopt a two three-limb combination interchange type, that is, a double-three-limb interchange, which is mostly a simple combination of trumpet, T-type or Y-type. This is a commonly used interchange type for centralized stopping tolls. If stopping is not required, there will be disadvantages of long detours and weaved operation of vehicles, which cannot meet the needs when the traffic volume is large. The best way to solve the problem is to cancel the weaved operation and replace the ramp layout. Based on practice and research, summarize and put forward four practical interchange types for comparative analysis. These interchange types are: T-trumpet, deformed double-trumpet, external reverse-flow double-trumpet, internal reverse-flow double-trumpet, these types of interchanges generally only need two or three flyover bridges to achieve no weaved operation. Some can be reconstructed on the basis of the existing double-trumpet interchange, and some are suitable for new interchanges. Because they can compress the land use to a greater extent, and the cost is relatively low, so they have better practicability.