Traveling through Japan in an electric car by expressway is pretty easy as there are a lot of CHAdeMO fast chargers available. The country has a fast charging infrastructure that is the envy of the rest of the world.
Soon (from May til the end of the fiscal year in March 2016), it will be even easier to access the network because the Ministry of Economy, Trade and Industry announced an expressway fee subsidy program for 40,000 electric and plug-in hybrids.
To get the subsidy, METI require just information on use of expressways and battery chargers for further projects.
Subsidies will be different throughout the various stages of the project, probably to determine how they affect the use of cars.