The Time Parameter
Time and mileage can be used to measure actual car usage and although there is a strong correlation between the two under certain conditions, measuring time provides more finely-tuned, effective data. Furthermore, time parameter is the “solution-of-choice” when a real and fast impact on air pollution, traffic congestion and efficient road usage are of interest. NHTSA. data show that risk exposure is better assessed when time of day and length of time the vehicle is being used are taken into consideration.
When the measured parameters are the “Hour of Travel” and the “Duration of Travel”, an incentive could motivate drivers to slightly change their habits – drive a little earlier or later and enjoy cost and time savings in return. The overall impact of this slight habit change can significantly reduce GHG emissions, road congestion and accident rate. The incentive could be in a form of a reduced cost per minute when driving at low-congestion, low-risk hours or in the form of higher rate for drivers who choose to drive at high-congestion, high-risk time of day.