“…Recent studies recognized speed as an important indicator of traffic safety for motorcyclists (Yannis and Evgenikos 2007). In several papers (Vlahogianni et al, 2012;Walton and Buchanan, 2012;Blackman and Haworth, 2013;Haque et al, 2009;Mannering and Grodsky, 1995;Phan et al, 2010;Hurt et al, 1981), speeds notably exceeding the speed limit are emphasized as key risk factors for accidents involving motorcyclists. Unsafe and inappropriate speed is a major traffic safety problem in many countries (OECD, 2006) and is an often discussed topic (Bjørnskau et al, 2012).…”