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

posted 20/03/2019

publication https://doi.org/10.1016/j.aap.2019.02.013

Accident Analysis & Prevention

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

SotirisVandoros^abIchiroKawachi^b

https://doi.org/10.1016/j.aap.2019.02.013

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Highlights

• We studied the relative risk of car collision on cannabis celebration day in Britain.

• We compared crashes on cannabis celebration day to control days using a random effects model.

•The risk of collision on cannabis celebration day is 17.9% higher than on control days.

Abstract

Cannabis celebration day, also known as  0 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.

Keywords

Cannabis celebration day
Traffic collisions
Great Britain