{"authority-rates.csv":"A bands use authority frost means. motorMiles are official aggregate all-motor miles. containedLsoas are geographic support, not rate-eligible LSOAs. Annual cells keep fixed A membership. pooled and no2021 are ratio-of-sums.","uncertainty":"Exact 95% Garwood Poisson intervals conditional on fixed miles, plus 2000 percentile resamples of entire authorities retaining repeated years. Authority-resampling intervals displayed only with at least five authorities; cross-authority spatial dependence and exposure error remain outside these intervals.","distinctClimateCells":"Unique 2 km climate cells under mapped road length, counted once per displayed group. They can overlap groups and are not independent weather observations. Do not sum these counts across bands.","populationDensity":"Mileage-weighted mean of authority resident population/km\u00b2; area context, not density of roads or collision locations.","urbanShare":"Mileage-weighted authority urban-resident proportion, not the proportion of driving on urban roads.","trunkShare":"Matched annual trunk-road motor-mile proportion from DfT authority data; not synonymous with major-road proportion. ContextCoverage fields show the share of displayed miles with the context field.","lsoa-band-support.csv":"Original D bands, shared-cell support and physical mapped road kilometres. No eligible motor mileage or rate. Urban/mixed/rural uses resident-share thresholds as in design.json; it is not an official categorical LSOA classification.","nulls":"Unavailable. Empty band counts/miles are null in rates; zero collisions with positive miles remain zero.","withoutLargestRate":"Descriptive leave-largest-mileage-authority-out rate, recomputed by ratio of sums. Not an adjusted model."}