Each factor lowers the score. A quiet residential street with full sidewalks might score 95+. A busy arterial with a partial sidewalk and no crosswalk can score below 20.
Every hazard report knocks points off that street's score. If other students confirm an existing report instead of filing a new one, that street's penalty grows β a crossing three students have flagged pulls the score down further than one nobody else has backed up. This keeps a single person from swinging the map, while real recurring problems still surface.
The app calculates two routes between your points: the shortest one, and a "recommended" one. The Route priority slider controls how much the recommended route avoids low-scoring streets β at "Fastest" it matches the shortest route; at "Safest" it will trade meaningful extra distance for a much higher-scoring path. The Safety Score shown for your route is the distance-weighted average across every street segment you'd walk or bike.