Repository logo
 

Evaluating the citywide Edinburgh 20mph speed limit intervention effects on traffic speed and volume: A pre-post observational evaluation.

Simple item page
cam.issuedOnline2021-12-31
datacite.contributor.supervisoreditor: Useche, Sergio A.
dc.contributor.authorNightingale, Glenna F
dc.contributor.authorWilliams, Andrew James
dc.contributor.authorHunter, Ruth F
dc.contributor.authorWoodcock, James
dc.contributor.authorTurner, Kieran
dc.contributor.authorCleland, Claire L
dc.contributor.authorBaker, Graham
dc.contributor.authorKelly, Mike
dc.contributor.authorCope, Andy
dc.contributor.authorKee, Frank
dc.contributor.authorMilton, Karen
dc.contributor.authorFoster, Charlie
dc.contributor.authorJepson, Ruth
dc.contributor.authorKelly, Paul
dc.contributor.orcidNightingale, Glenna F [0000-0002-0110-3939]
dc.contributor.orcidWilliams, Andrew James [0000-0002-2175-8836]
dc.contributor.orcidWoodcock, James [0000-0003-4769-5375]
dc.contributor.orcidKelly, Mike [0000-0002-2029-5841]
dc.contributor.orcidCope, Andy [0000-0001-8506-5054]
dc.date.accessioned2022-01-07T16:53:01Z
dc.date.available2022-01-07T16:53:01Z
dc.date.issued2021
dc.date.submitted2021-07-19
dc.date.updated2022-01-07T16:53:00Z
dc.description.abstractOBJECTIVES: Traffic speed is important to public health as it is a major contributory factor to collision risk and casualty severity. 20mph (32km/h) speed limit interventions are an increasingly common approach to address this transport and health challenge, but a more developed evidence base is needed to understand their effects. This study describes the changes in traffic speed and traffic volume in the City of Edinburgh, pre- and 12 months post-implementation of phased city-wide 20mph speed limits from 2016-2018. METHODS: The City of Edinburgh Council collected speed and volume data across one full week (24 hours a day) pre- and post-20mph speed limits for 66 streets. The pre- and post-speed limit intervention data were compared using measures of central tendency, dispersion, and basic t-tests. The changes were assessed at different aggregations and evaluated for statistical significance (alpha = 0.05). A mixed effects model was used to model speed reduction, in the presence of key variables such as baseline traffic speed and time of day. RESULTS: City-wide, a statistically significant reduction in mean speed of 1.34mph (95% CI 0.95 to 1.72) was observed at 12 months post-implementation, representing a 5.7% reduction. Reductions in speed were observed throughout the day and across the week, and larger reductions in speed were observed on roads with higher initial speeds. Mean 7-day volume of traffic was found to be lower by 86 vehicles (95% CI: -112 to 286) representing a reduction of 2.4% across the city of Edinburgh (p = 0.39) but with the direction of effect uncertain. CONCLUSIONS: The implementation of the city-wide 20mph speed limit intervention was associated with meaningful reductions in traffic speeds but not volume. The reduction observed in road traffic speed may act as a mechanism to lessen the frequency and severity of collisions and casualties, increase road safety, and improve liveability.
dc.identifier.doi10.17863/CAM.79866
dc.identifier.eissn1932-6203
dc.identifier.issn1932-6203
dc.identifier.otherpone-d-21-23482
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/332420
dc.languageen
dc.publisherPublic Library of Science (PLoS)
dc.subjectResearch Article
dc.subjectEngineering and technology
dc.subjectMedicine and health sciences
dc.subjectBiology and life sciences
dc.subjectSocial sciences
dc.subjectEarth sciences
dc.subjectResearch and analysis methods
dc.titleEvaluating the citywide Edinburgh 20mph speed limit intervention effects on traffic speed and volume: A pre-post observational evaluation.
dc.typeArticle
dcterms.dateAccepted2021-11-29
prism.issueIdentifier12
prism.publicationNamePLoS One
prism.volume16
pubs.funder-project-idnational institute for health research (15/82/12)
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
rioxxterms.versionVoR
rioxxterms.versionofrecord10.1371/journal.pone.0261383

Files

Original bundle
Now showing 1 - 3 of 3
No Thumbnail Available
Name:
pone.0261383.xml
Size:
89.46 KB
Format:
Extensible Markup Language
Description:
Bibliographic metadata
Licence
http://creativecommons.org/licenses/by/4.0/
Download
No Thumbnail Available
Name:
additional-files.zip
Size:
1.45 MB
Format:
ZIP file
Description:
Supporting information
Licence
http://creativecommons.org/licenses/by/4.0/
Download
Thumbnail Image
Name:
pone.0261383.pdf
Size:
793.52 KB
Format:
Adobe Portable Document Format
Description:
Published version
Licence
http://creativecommons.org/licenses/by/4.0/
Download

Collections

Jisc Publications Router