A strategic framework for road safety analysis in the connected and autonomous vehicle era
Bibliographic record
Abstract
The upcoming era of connected and autonomous vehicles (CAVs) will generate vast trajectory data, enabling advanced road safety assessments. This study proposes a framework using vehicle trajectory data to identify high-risk clusters and analyse contributing factors. Using the pNEUMA dataset from Athens, Greece, comprising over 500,000 vehicle trajectories, traffic conflicts were calculated to develop a severity index based on conflict frequency, severity, and vehicle dynamics. High-risk segments were identified using a clustering algorithm and a Random Forest (RF) model with SHAP analysis evaluated contributing factors. Eleven unsafe clusters were detected, with traffic volume, conflict frequency, vehicle composition, and speed being key predictors. The RF model achieved 91% accuracy and an F1-score of 0.60. The framework offers municipalities a valuable tool to identify unsafe locations and implement targeted safety interventions, improving network-wide road safety.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.014 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".