It's the latest viral trend, sharing a screenshot and explanation of your Roads and Highways Route Concurrency Rules:
Ours is pretty basic:
Its the lesser of route ID parameters but the top rule is a dominance event "Route Dominance" that identifies exceptions to the logic, with 19 exceptions designed to prevent double-counting centerline mileage for locations where opposite carriageway results in logical primary on each side.
I'd like to know how other states define concurrency rules to gain insight to practices.
