1. AASHO (1960) Road user benefits for highway improvements, a report by the committee on planning and design policies. American Association of State Highway Officials, Washington, DC, pp 1–152
2. Ang BW (1989) Modeling of petrol consumption under data constraints. Pacific and Asian Journal of Energy 3:93–104
3. Ang BW (1992) Restraining automobile ownership and usage and transportation energy demand: the case of Singapore. The Journal of Energy and Development 17:263–278
4. Ang BW, Chin ATH (1996) Energy, environment and transport policy in Singapore. In: Hills P, Barron W, Ng J (eds) Energy, transport and the environment in Asia. Centre of Urban Planning and Environmental Management, University of Hong Kong, Hong Kong, pp 231–275
5. Ang BW, Oh ST (1988) Transport and traffic management schemes and energy saving in Singapore. The International Journal 13:141–148