"On the cost methodology, it appears that the total cost of vehicles in the transport sector is incuded. While one could understand including the incremental cost of, say, electric vehicles or plug-in hybrids over "conventional" petrol or diesel cars, to count in the total cost of the vehicles seems illogical."

The calculator give the user the option of choosing to travel less, and to travel differently (for instance, for a greater proportion of journeys to be by train or bicycle thank today). To fully account for the cost impact of this option, and its interaction with the choice about what sort of vehicle is used (conventional, electric or hydrogen) the total cost of vehicles was included.

Note that, at the moment, the total cost of aircraft and ships are not included.

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