Comment Re:how could it save... (Score 1) 411
they're not exactly fudging numbers
the FHWA puts out numbers valuing travel in terms of dollars. they do this for travel time and mileage, for both passenger vehicles and commercial trucks. how they get these numbers is questionable, but it's basically a combination of the money people earn from their jobs versus the length/duration of their commute. there are also breakdowns for different types of trips (work, shopping, leisure) and the length of the trip itself (a short trip has a different valuation per mile than a long one).
what the insurance people have done is to take these values and work them against the cost per mile of the variable-priced insurance policies and the average cost per mile of the fixed-price insurance policies. given some data on average trip lengths and distribution of trip purposes, you can build a monetization of travel under the two schemes.
the carbon savings comes from people driving less due to the higher cost of insurance relative to their valuation of their travel. if you're paying more for insurance because you drive to the liquor barn every other night to pick up a fifth of whiskey, you might think twice about obtaining such libation. saves money on liquor, too.
frankly, if this does go through in california and elsewhere, it could start to shift the USA away from suburbia hell back towards walkable town centers.