Before revision:  We show that both congestion surcharges can reduce the TNC ridership, but their impacts are mitigated by the wage floor and cannot significantly reduce the number of TNC vehicles . In contrast to the trip-based surcharge, we advocate the time-based congestion surcharge, which penalizes idle vehicle time and improves the vehicle occupancy.
After revision:  We show that both congestion surcharges can reduce the TNC ridership, but their impacts are mitigated by the wage floor and cannot significantly reduce the number of TNC vehicles reduced is not significant. The time-based charge is preferable to the trip-based surcharge, we advocate the time-based congestion surcharge, which penalizes idle vehicle time and improves the vehicle occupancy.