* National expressways: 100 km/h (62 mph)
* National highways: 80 km/h (50 mph)
* Prefectural roads: 60 km/h (37 mph)
* City streets: 40 km/h (25 mph)
* School zones: 30 km/h (19 mph)
Please note that these are general speed limits and there may be variations in some areas. It's always important to obey the posted speed limits and drive safely.