I would like to suggest the following in incentivizing drivers to use mass transport systems rather than their own car. TM holds a bank of a cars' mileage, therefore, it should be easy to determine who was using his/her car less frequently than usual over a period of time (a year in this case). Moreover, one can check with Tallinja card whether the bus was used instead. There may be other options as well as car pooling. A driver's car registering lower mileage may benefit from substantial saving in licence fee paid (getting a discount subject to usage). This applies mainly to cars running on fossil fuel but may be extended further to those running on gas or electricity.