Let's take a look at some of the challenges involved in highway driving in Japan, most prominently, the road signs you will need to pay attention to. Getting on the Highway in Japan In many cases, there are different highway entrances for inbound and outbound lanes, and there is usually a tollgate at the entrance. Most cars in Japan use an automatic toll payment system called ETC. If you are in a  rental car , it will almost always have an ETC card inside a special card reader. You do not need to remove the card, just drive through the lane marked "ETC".

https://livejapan.com/en/article-a0000204/

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