{"title":"Investigating distance halo effect of fixed automated speed camera based on taxi GPS trajectory data","authors":"Chuanyun Fu , Hua Liu","doi":"10.1016/j.jtte.2021.05.005","DOIUrl":null,"url":null,"abstract":"<div><h3>Background</h3><p>The deterrence effect of automated speed camera (ASC) is still inconclusive. Moreover, it is pointed out that ASC may have varying deterrence effects on different types of road users (e.g., taxis).</p></div><div><h3>Objective</h3><p>This study intends to investigate the distance halo effect of fixed ASC (hereafter called ASC) on taxis.</p></div><div><h3>Method</h3><p>More than 1.34 million taxis' GPS trajectory data were collected. A novel indicator, the delta speed (defined as the difference between the traveling speed and the speed limit), was proposed to continuously describe the variations in traveling speeds. The upstream and downstream critical delta speeds during each time period on weekdays and weekends were obtained by using <em>K</em>-means clustering method, respectively. Based on the critical delta speeds, the ranges of upstream and downstream distance halo effects of ASC during different time periods on weekdays and weekends were determined separately and compared.</p></div><div><h3>Results</h3><p>The downstream critical delta speed is smaller than the upstream one. The upstream and downstream distance halo effects of ASC on taxis are within a range of 8–2180 m and an area of 10–580 m to the ASC location, respectively. There are no obvious difference in the ranges of upstream and downstream distance halo effects of ASC on taxis between different time periods or between weekdays and weekends.</p></div><div><h3>Conclusion</h3><p>The present study confirms that the upstream and downstream distance halo effects of ASC on taxis have different ranges and the stabilities of time-of-day and day-of-week. Practical application: The findings of this study can provide a basic reference for reasonably deploying ASCs within a region.</p></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":null,"pages":null},"PeriodicalIF":7.4000,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Traffic and Transportation Engineering-English Edition","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2095756423000053","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
引用次数: 3
Abstract
Background
The deterrence effect of automated speed camera (ASC) is still inconclusive. Moreover, it is pointed out that ASC may have varying deterrence effects on different types of road users (e.g., taxis).
Objective
This study intends to investigate the distance halo effect of fixed ASC (hereafter called ASC) on taxis.
Method
More than 1.34 million taxis' GPS trajectory data were collected. A novel indicator, the delta speed (defined as the difference between the traveling speed and the speed limit), was proposed to continuously describe the variations in traveling speeds. The upstream and downstream critical delta speeds during each time period on weekdays and weekends were obtained by using K-means clustering method, respectively. Based on the critical delta speeds, the ranges of upstream and downstream distance halo effects of ASC during different time periods on weekdays and weekends were determined separately and compared.
Results
The downstream critical delta speed is smaller than the upstream one. The upstream and downstream distance halo effects of ASC on taxis are within a range of 8–2180 m and an area of 10–580 m to the ASC location, respectively. There are no obvious difference in the ranges of upstream and downstream distance halo effects of ASC on taxis between different time periods or between weekdays and weekends.
Conclusion
The present study confirms that the upstream and downstream distance halo effects of ASC on taxis have different ranges and the stabilities of time-of-day and day-of-week. Practical application: The findings of this study can provide a basic reference for reasonably deploying ASCs within a region.
期刊介绍:
The Journal of Traffic and Transportation Engineering (English Edition) serves as a renowned academic platform facilitating the exchange and exploration of innovative ideas in the realm of transportation. Our journal aims to foster theoretical and experimental research in transportation and welcomes the submission of exceptional peer-reviewed papers on engineering, planning, management, and information technology. We are dedicated to expediting the peer review process and ensuring timely publication of top-notch research in this field.