Effect of Improving the Visibility of the Traffic Path on Vehicles Speeds and Safety at Work Zones
Notice bibliographique
Résumé
Because of the documented mobility issues and safety risks associated with work zones, extra attention is required when designing the layout of traffic control devices. Current traffic accommodation guidelines at work zones have certain limitations that potentially cause driver confusion and is often ineffective at reducing speeds. This study conducted a comprehensive review of frequent safety problems around work zones to identify common types of collisions and the major factors contributing to collision occurrences. The study then outlined different combinations of highly reflective and visible intervention materials from 3M Canada that were implemented at several work zones. These intervention materials, such as temporary reflective tape, removable black mask, and other fluorescent and highly reflective materials, were used to better demarcate the desired traffic paths for drivers as they passed through work zones. Finally, the impact of these interventions on traffic safety was evaluated in order to understand the relationship between improving the visibility of the traffic path and vehicle speed at work zones. Prior studies indicate that speeding and inefficient traffic control devices are the main factors impacting safety around work zones. Therefore, a particular aim of this project was to evaluate the impact of 3M intervention materials in different combinations on vehicle speed through work zones. To do so, the study monitored before and after speeds at nine construction sites in the City of Edmonton (COE) during the summer months of 2019. These treatment sites were chosen in collaboration with COE’s Traffic Operations group. Sites were also chosen as controls to account for confounding factors in the before and after analysis. This represents an experimental, observational study design to assess the effect of work zone interventions on driver speeds. The results showed that increasing the visibility of the traffic path at work zones using the combinations of 3M high reflective and visible products led to significant vehicle speed reductions at the treatment sites that ranged between 4.7 to 11.6 km/h. The effectiveness of the interventions was either unidirectional or bidirectional, depending on the placement of the interventions. In addition, an improvement in drivers’ speed limit compliance was observed in the ‘after’ period. Furthermore, the outcomes showed that observed vehicle speed reductions during working hours were higher than the values in non-working hours. A traffic conflict analysis revealed that there were no near misses or accidents during the test period, further indicating that the installed intervention materials did not cause any traffic issues or conflicts. Results found in this study can greatly assist traffic safety agencies to optimize the use of traffic intervention materials at work zones and provide more details about the effective use of the reflective control devices.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,003 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,001 |
| Bibliométrie | 0,001 | 0,000 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,001 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,005 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».