Intelligent Infrastructure for Enhancing Vulnerable Road User Safety using Machine Vision Technologies
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Abstract Vulnerable road users (VRUs), such as pedestrians and bicyclists, face a higher risk of severe injuries and fatalities in road collisions, with intersections being particularly hazardous. Enhancing VRU safety at intersections is therefore critical for a safer transportation system. This study introduces a proof-of-concept system capable of detecting VRUs at intersections leveraging image data from vision sensors mounted on roadside infrastructure (e.g., traffic poles). The approach includes the development of a unique VRU detection dataset, comprising labeled images of various VRU types – adults, children, and bicyclists – captured under a range of illumination and weather conditions at real-world public intersections. This dataset addresses a notable gap in VRU detection research, as few datasets offer such environmental diversity from a roadside infrastructure perspective. The dataset was leveraged to train state-of-the-art deep learning models optimized for VRU detection. The models were evaluated using data from both public intersections and a controlled test facility, with particular focus on performance under challenging conditions such as snow and low nighttime visibility. Real-time performance benchmarking of the models was assessed, highlighting their effectiveness in dynamic environments. The results demonstrated that the best model achieved a mean average precision (mAP) of 82% in VRU detection while processing full-HD (1920 $$\times $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>×</mml:mo> </mml:math> 1080) frames in real time at 75 ms. Additionally, major challenges in VRU detection at intersections were identified, and recommendations for future research directions were provided.
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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 | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.002 | 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 it