This report summarizes several actual and potential congestion-charging programs aimed in reducing motor-vehicle traffic.

This report focuses on heavy-duty natural gas engine technologies that can achieve Euro III, IV, V and VI emission compliance levels. It is based on a comprehensive review of technical literature regarding emission performance &  technologies was performed for compressed natural gas engines of model year 2000 and newer.

This report by ICCT reviews current trends in motorcycle emissions and fuel efficiency technology. Summarizes policy approaches to improve motorcycle emission and energy performance, and discusses what is required to implement these policies.