What is a constrained roadway?
A constrained roadway is a roadway that will not be expanded with additional through lanes because of physical, environmental or policy constraints. Physical constraints primarily occur when intensive land use development is immediately adjacent to roads, thus making expansion costs prohibitive. Environmental and policy constraints primarily occur when decisions are made not to expand a road based on environmental, historical, archaeological, aesthetic or social impact considerations.

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1. What is concurrency?
2. What is a constrained roadway?
3. What is a backlogged roadway?