Table 2.

Summary of included systematic reviews

Category	Number of reviews	Systematic reviews
Driver education	4	Curry et al., 2015 [19], Ker et al., 2005 [20], Korner-Bitensky et al., 2009 [21], Roberts and Kwan, 2001 [22]
Enforcement	11	Aeron-Thomas and Hess, 2005 [23], Blais and Dupont, 2005 [24], Bunn et al., 2003 [12], Elder et al., 2002 [25], Erke, 2009 [26], Erke et al., 2009 [27], Goss et al., 2008 [28], Høye, 2014 [29], Peek-Asa, 1999 [30], Pilkington and Kinra, 2005 [31], Wilson et al., 2010 [32]
Legislation	3	Foss and Evenson, 1999 [33], Russell et al., 2011 [34], Zwerling and Jones, 1999 [35]
Mixed Interventions	3	Aguilera et al., 2014 [36], Bergen et al., 2014 [37], Lefio et al., 2018 [38]
Other interventions	3	Ditter et al., 2005 [39], Kwan and Mapstone, 2006 [40], Subzwari et al., 2009 [41]
Public Awareness	5	Duperrex et al., 2002 [42], Elder et al., 2005 [43], Elder et al., 2004 [44], Phillips et al., 2011 [45], Yadav and Kobayashi, 2015 [46]
Structural improvement	4	Beyer and Ker, 2009 [47], Elvik, 2003 [48], Elvik, 2017 [49], Fu et al., 2016 [50]
Vehicle Design Improvement	2	Elder et al., 2011 [51], Erke, 2008 [26]