J. and Trumper, H. (2014), “Safer speeds: public acceptance and compliance”, Research Report 563, NZ Transport Agency, Wellington, New Zealand. Traffic Engineering, 11 (41). This paper reviews mobility and safety challenges of an ageing population and describes and describes measures that can contribute to keep up or to enhance the safe mobility of older citizens. It was 24% in 2001 and this rose to 36% in 2013.