Even worse, Norway subsidizes electric cars, in part, by defunding public transit. This seems silly from an environmental perspective, but it's nice if you're a wealthy Norwegian and want to avoid paying tolls while owning a luxury car.
"[The environmental spokesman for the Labor party] estimates that Oslo loses about [$30mm USD equivalent] a year from electric cars avoiding toll payments. At the same time, about [$80mm USD equivalent] from toll booths goes towards paying for public transport each year."[1]
There are much more effective ways to decarbonize transportation than subsidizing cars, electric or otherwise. The most compelling policy tool we have is a Carbon Tax. There is near universal consensus among economists on this fact. [2]
[0] https://www.vox.com/2015/11/24/9792474/energy-tax-credits-in... [1] https://www.ft.com/content/84e54440-3bc4-11e7-821a-6027b8a20... [2] http://www.igmchicago.org/surveys/carbon-tax