Accessible Route Evaluator

This evaluator scores three ADA route requirements independently and combines them into a weighted Overall Score: slope and width compliance are each worth 35 points, surface compliance is worth 30. Max Slope compliance is a step function -- full credit at or below 5% (the §403.3 running-slope limit of 1:20), half credit up to 8.33% (the ADA ramp maximum), and zero above that -- so raising the slope past either threshold drops the score even though the calculator never penalizes small increases within a compliant band. (The ADA's companion cross-slope limit, also in §403.3, is 1:48 -- about 2.1% -- which this tool doesn't score separately since it only collects a single running-slope figure.) Minimum Width works the same way, stepping down at 44" and again at 36": the ADA's hard floor under §403.5.1 is 36 inches of continuous clear width, with passing spaces at least 60 by 60 inches required every 200 feet wherever the route is narrower than 60 inches (§403.5.3); 44 inches is a common accessible-route design target for comfortable two-way passage between those passing spaces rather than itself a numbered minimum.

Surface Type is a coded selector (1=Concrete, 2=Asphalt, 3=Gravel), not a continuous quantity: concrete earns full surface credit, asphalt earns 80%, and gravel earns zero because it fails the ADA requirement for a firm, stable, slip-resistant surface -- nudging the Surface value by a fraction of a unit does nothing, only actually switching between the three surface types changes the score. Route Length is collected for project reference only and never enters any of the four scores.