This research project centres on designing and testing effective pricing schemes for the Electronic Road Pricing (ERP2) system. ERP2 is a Global-Navigation-Satellite-System (GNSS)-based, in-vehicle meter that allows for more flexibility in managing traffic congestion and other negative externalities through distance, time, and route-based road pricing. The Land Transport Authority of Singapore (LTA) is rolling out ERP2 in the coming years but has yet to decide how distance-based charging will be implemented under the system. This project focuses on designing ERP2 pricing scheme, testing the effectiveness of the proposed schemes through Randomized Controlled Trials (RCT), and understanding the underlying behavioural mechanisms.