Collision EDA — STATS19

Exploratory analysis of STATS19 collision records, including temporal, severity, road-type, and spatial patterns relevant to modelling.

Last updated: 2026-07-04 · Data coverage: 2015–2024.

1 Overview

This page explores the raw STATS19 collision records for the Great Britain study area before any spatial joining or modelling. The goal is to understand the coverage, quality, and structure of the outcome variable.

Note

The sharp drop in 2020–2021 reflects COVID-19 lockdowns reducing traffic and reported collisions. Both years are flagged is_covid = True and treated separately where needed.

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2 Severity distribution

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3 Temporal patterns

3.1 By day of week

3.2 By hour of day

3.3 By month

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4 Road context

4.1 Road type and class

4.2 Speed limit

4.3 Urban vs rural and junction context

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5 Light conditions

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6 Coordinate quality

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7 Key observations

Note

These raw proportions describe the collision dataset, not collision risk. Risk requires dividing by exposure (vehicle-kilometres). Roads with high urban or junction proportions may look dangerous here but score differently after the exposure model is applied in Stage 2.