Interchange is an essential part. of freeway, whose form is various and complicated. Interchange is important hub and node of freeway, which plays an important role in vehicles running on freeway. the setting problem of collector-distributor road in the scope of interchanges on freeway, such as cloverleaf, cotyledons interchange, etc.. The issues that which connection form is adopted between two annular ramp, how much turn traffic volume the distance can adapt need to be resolved. When the distance is too l...