Network effects spread
Detours move traffic and curb activity to neighbouring streets.
Service operators need notice
Transit agencies, waste crews, delivery services and utilities may need different temporary arrangements.
Accessibility must remain part of the plan
Pedestrian and mobility access can be disrupted even when vehicles have a detour.
Construction planning is systems planning
The useful question is which services rely on the corridor, not only how many cars use it.
Scope boundary. This page explains system relationships at a planning level. Real utility, transportation, emergency, structural, electrical, cybersecurity and public-safety decisions require local agencies and qualified professionals.