What would happen to road availability if two lanes and roundabouts were applied to NM502 corridor?

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To consider availability and safety, let's continue to combine the effects of implementing both of the two largest changes proposed in the NM502 Corridor Study: decreasing the number of thru-traffic lanes and installing roundabouts. As we have seen in the case of capacity and efficiency, the adverse effects of two lanes and roundabout(s) reinforce each other for availability.

Near future, if reworked as proposed: A major overhaul, it's obvious, will greatly reduce availability over the period of construction and should only be undertaken if there is a major problem. I further think that there is no major problem with availability on Trinity.

Farther future, if proposal were implemented: When a major signalized intersection is being reworked, the process is messy and quite inconvenient. However, even though congestion increases, traffic still flows. The process works better if there are two lanes per direction.

When I think about reconstructing a roundabout, I can hardly imagine a path that would accomplish the modifications without an even greater disruption, or possibly completely shutting down traffic. If there is a way to keep traffic flowing within the space constraints of an urban environement, I think the extra work and cost involved would be substantial. This expectation should be addressed for existing roundabouts before commiting to the planned changes.

Proposed major rework of NM502 would greatly reduce availability


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