Flyovers
A double junction can be grade separated so that there is no flat crossing, reducing conflicts and reducing congestion. Flyovers require a lot of space both lengthwise and crosswise, and cannot always be built. Flying junction example at Aynho Junction. Diving junctions such as at Chatswood are a variant. Weaver Junction is the oldest flying junction in the United Kingdom and perhaps the world. See also Aynho Junction.
- SPAD protection
Because the diamond crossing or equivalent is eliminated, one of the potential SPAD hazards is also eliminated, leaving just the merging junction hazard.
Read more about this topic: Double Junction, Grade Separated