Traffic congestion is becoming an increasingly urgent problem for many metropolitan areas around the world. With limited resources for expanding transportation infrastructure, alternative solutions have been sought using congestion pricing. The effects of congestion pricing depend on the reactions of individual drivers to the pricing schemes, including the extent to which travel time reliability is perceived by drivers to be affected by tolls. This workshop considers the theoretical and econometric modeling of individual choice over transportation options when there is risk and uncertainty over attributes such as travel time and reliability. The congestion effects on transportation systems from individual reactions to the pricing schemes will also be considered.