'Well, it seemed like a good idea at the time...'

The 'unintended consequences' of excluding electric cars from high tolls in Norway (WSJ):

On the losing side of Mr. Nordbø’s commute are local municipalities, including Finnøy, which went into debt to dig the $70 million tunnel but charge no fee on electric cars because of national policies aimed at curbing carbon emissions.

The incentive helped convince many islanders to shift to electric cars. The vehicles now account for about a quarter of tunnel traffic, and allow owners to dodge one of the heaviest toll burdens in the country.