Grade-Separated Interchange
INT-GSI-037 Intersections & CrossingsGrade-Separated Interchange
An interchange carrying conflicting movements on separate vertical levels, connected by ramps, eliminating at-grade conflict entirely. Freeway-scale only.
Typical at: Undeveloped Rural Suburban
Compact and Urban are edge cases. Core is an unlikely pairing.
#Design notes
This is an acknowledged fallback for genuinely Freeway-scale volume or speed beyond what even a turbo-roundabout can manage, not a general-purpose alternative to the Commonway System's roundabout-first intersection philosophy. It stays confined to the density range where full Freeway-scale roads themselves are realistic.
Unsourced claim
Formal citations for this pattern have not yet been compiled from primary sources.