Going through the ETC - the automated highway payment system which deducts money from your credit card when you drive through. Without an ETC installed, one would have to stop and pay in cash at the gates. We paid roughly 2,800 yen to use the highways from Tokyo to Hakone.
The roads are in generally good condition so I don't mind paying to use the highways. As far as I remember, the highways were free to use in the US but many were in bad condition. Do they charge to use highways in your dominion?