Route Impact Score — Custom Route Planning Feedback

[faizm10]

Overview

After designing a custom route, automatically compute a planning scorecard: how many people does it serve, how much new coverage does it add vs the existing GO network, and how does its frequency compare?

Why it's unique

Turns the route builder from a drawing tool into actual planning software. Gives instant quantitative feedback on whether a proposed route is useful — the same kind of analysis transit agencies do manually.

Metrics to compute

Metric	Description
Population served	People within 800m of each custom stop (from census data)
New coverage	% of route's walkshed not already covered by GO
Frequency grade	A–F based on trips/hour during peak
Network connectivity	How many existing GO stops does this route connect to?
Estimated corridor length	km of new infrastructure required

Key interactions

• Scorecard panel auto-updates as stops are added/removed in the Route Builder
• Compare two custom routes side by side
• "How does my route compare to the Barrie Line?" — benchmark against real GO lines
• Share route with scorecard embedded in community post

Integration points

• Route Builder (components/panels/BuilderWizard.tsx) — add live scorecard panel
• Community post (app/community/[id]/page.tsx) — display scorecard alongside shared route
• lib/routeScoring.ts already exists — extend it with population + coverage dimensions

Acceptance criteria

• Scorecard appears in Route Builder after 2+ stops are added
• Population served updates when stops change
• New coverage % calculated against existing GO walkshed
• Scorecard visible on community post detail page