Hi! I´m back from Japan. Amazing Country, and, as said in this topic, hard to drive in there! It is quite curious how one of the biggest car magnufacturers in the world is such a "Car Enemy": expensive tolls (70 euros Tokyo to Kyoto), expesive car parking 3 Euros/hour all around, narrow roads, too many trucks in highways occupying all the lines, and traffic lights all around with 40 to 60 Km/h speed limit in conventional roads. I guess too many people in a narrow space...
Anyways! the car experience, from my point of view was worthy because we travelled with big suitcases and collecting gifts troughtout the trip wouldn´t had helped. Good we had a japanese GPS.
Tokyo to Kyoto was about 6 hous by highway (510 km) so 85 Km/h was the average. AND Kyoto to Koyasan, 138 Km took us 2h 45 minutes, that´s a 40-45 km/h average, a long journey trhough traffic lights and curvy mountain roads, but not so bad. It is true in Spain we are used to 80-100 km/h average in national roads, but there´s always two rows and the speed limit is higher.
Anyway if you want to deal with agressive drivers, come to Madrid in rush hour!!!