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The relative risk of motor vehicle collision on cannabis celebration day in Great Britain

Research output: Contribution to journalArticle

Sotiris Vandoros, Ichiro Kawachi

Original languageEnglish
Pages (from-to)248-252
Number of pages5
JournalAccident Analysis and Prevention
Volume128
Issue numberFebruary
DOIs
Publication statusPublished - 1 Jul 2019

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Abstract

Cannabis celebration day, also known as “420 day”, takes place at 4:20pm on April 20 every year. The objective of this paper is to study whether there is an increase in road traffic collisions in Great Britain on that day. We used daily car crash data resulting in death or injury from all 51 local police forces covering Great Britain over the period 2011–2015. We compared crashes from 4:20pm onwards on April 20 to control days on the same day of the week in the preceding and succeeding two weeks, using panel data econometric models. On the average cannabis celebration day in Britain, there were an additional 23 police-reported collisions compared to control days, corresponding to a 17.9% increase in the relative risk of collision.

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