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Investigating the impact of a 20 miles per hour speed limit intervention on road traffic collisions, casualties, speed and volume in Belfast, UK : 3 year follow-up outcomes of a natural experiment
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dc.contributor.author | Hunter, Ruth | |
dc.contributor.author | Cleland, Claire | |
dc.contributor.author | Busby, John | |
dc.contributor.author | Nightingale, Glenna | |
dc.contributor.author | Kee, Frank | |
dc.contributor.author | Williams, Andrew James | |
dc.contributor.author | Kelly, Paul | |
dc.contributor.author | Kelly, Michael | |
dc.contributor.author | Milton, Karen | |
dc.contributor.author | Kokka, Kelly | |
dc.contributor.author | Jepson, Ruth | |
dc.date.accessioned | 2022-11-21T16:30:17Z | |
dc.date.available | 2022-11-21T16:30:17Z | |
dc.date.issued | 2023-01-01 | |
dc.identifier | 282169962 | |
dc.identifier | 63fe26fa-a4d0-4dea-a01b-a1bbb40617d9 | |
dc.identifier | 85143903490 | |
dc.identifier | 000890256600001 | |
dc.identifier.citation | Hunter , R , Cleland , C , Busby , J , Nightingale , G , Kee , F , Williams , A J , Kelly , P , Kelly , M , Milton , K , Kokka , K & Jepson , R 2023 , ' Investigating the impact of a 20 miles per hour speed limit intervention on road traffic collisions, casualties, speed and volume in Belfast, UK : 3 year follow-up outcomes of a natural experiment ' , Journal of Epidemiology and Community Health , vol. 77 , no. 1 , pp. 17-25 . https://doi.org/10.1136/jech-2022-219729 | en |
dc.identifier.issn | 0143-005X | |
dc.identifier.other | ORCID: /0000-0002-2175-8836/work/123196332 | |
dc.identifier.uri | https://hdl.handle.net/10023/26459 | |
dc.description | Funding: This study was fund by Public Health Research Programme (15/82/12). | en |
dc.description.abstract | Background Evidence regarding the effectiveness of 20 miles per hour (mph) speed limit interventions is limited, and rarely have long-term outcomes been assessed. We investigate the effect of a 20 mph speed limit intervention on road traffic collisions, casualties, speed and volume at 1 and 3 years post-implementation. Methods An observational, repeated cross-sectional design was implemented, using routinely collected data for road traffic collisions, casualties, speed and volume. We evaluated difference-in-differences in collisions and casualties (intervention vs control) across three different time series and traffic speed and volume pre-implementation, at 1 and 3 years post-implementation. Results Small reductions in road traffic collisions were observed at year 1 (3%; p=0.82) and year 3 post-implementation (15%; p=0.31) at the intervention site. Difference-in-differences analyses showed no statistically significant differences between the intervention and control sites over time for road traffic collisions. There were 16% (p=0.18) and 22% (p=0.06) reductions in casualty rates at years 1 and 3 post-implementation, respectively, at the intervention site. Results showed little change in mean traffic speed at year 1 (0.2 mph, 95% CI −0.3 to 2.4, p=0.14) and year 3 post-implementation (0.8, 95% CI −1.5 to 2.5, p=0.17). For traffic volume, a decrease in 57 vehicles per week was observed at year 1 (95% CI –162 to −14, p<0.00) and 71 vehicles at year 3 (95% CI −213 to 1, p=0.05) post-implementation. Conclusion A 20 mph speed limit intervention implemented at city centre scale had little impact on long-term outcomes including road traffic collisions, casualties and speed, except for a reduction in traffic volume. Policymakers considering implementing 20 mph speed limit interventions should consider the fidelity, context and scale of implementation. | |
dc.format.extent | 9 | |
dc.format.extent | 327608 | |
dc.language.iso | eng | |
dc.relation.ispartof | Journal of Epidemiology and Community Health | en |
dc.subject | HE Transportation and Communications | en |
dc.subject | RA0421 Public health. Hygiene. Preventive Medicine | en |
dc.subject | 3rd-NDAS | en |
dc.subject | SDG 3 - Good Health and Well-being | en |
dc.subject | MCC | en |
dc.subject.lcc | HE | en |
dc.subject.lcc | RA0421 | en |
dc.title | Investigating the impact of a 20 miles per hour speed limit intervention on road traffic collisions, casualties, speed and volume in Belfast, UK : 3 year follow-up outcomes of a natural experiment | en |
dc.type | Journal article | en |
dc.contributor.institution | University of St Andrews. School of Medicine | en |
dc.contributor.institution | University of St Andrews. Population and Behavioural Science Division | en |
dc.identifier.doi | https://doi.org/10.1136/jech-2022-219729 | |
dc.description.status | Peer reviewed | en |
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