Japan Speed Limits: 60 km/h, 30 km/h Residential Roads, Mopeds 30

Statutory speed limits (from September 1, 2026)

The statutory speed limit (法定速度) is the maximum on roads where no speed is set by signs or markings (Road Traffic Act Art. 22; Enforcement Order Arts. 11 and 12). If a sign sets a limit, that posted limit applies instead.

Motorcycles (large and standard) count as "motor vehicles" (自動車) under Japanese law, so the moped limit of 30 km/h does not apply to them. Mopeds, on the other hand, are capped at 30 km/h even where a sign allows more (for example 40 km/h).

The September 2026 change: 30 km/h on residential roads

An amendment to the Road Traffic Act Enforcement Order (道路交通法施行令) lowered the statutory limit for motor vehicles on ordinary roads without a center line from 60 km/h to 30 km/h, effective September 1, 2026. The National Police Agency (警察庁) describes these as "residential roads" (生活道路), used mainly by local residents in daily life. The Rules of the Road (交通の方法に関する教則), which define the test's scope, were amended on the same day.

The following roads stay at 60 km/h. Put the other way round: any ordinary road not on this list is now 30 km/h.

Signs still take priority. A 60 km/h road with a "30" sign is 30 km/h, and a 30 km/h residential road with a "40" sign is 40 km/h (National Police Agency explanation).

• Ordinary roads with a center line (中央線) or vehicle traffic lanes (車両通行帯) shown by signs or markings
• Ordinary roads where the two directions are physically separated by a median, fence or similar structure
• Motor-vehicle-only roads (自動車専用道路)
• Parts of national expressways other than the main lanes and their acceleration/deceleration lanes

The maximum is a ceiling; minimum speeds exist only on expressways

A statutory limit is a ceiling, not a target. In rain, at night, in heavy traffic or with poor visibility, you must slow down to a speed that is safe for the conditions. "As long as you stay within the limit, you may drive at that speed regardless of conditions" is FALSE.

Ordinary roads have no statutory minimum speed unless a sign sets one. The statutory minimum of 50 km/h applies only to the main lanes (本線車道) of national expressways (excluding undivided two-way sections).

What "slow down" (徐行) means, and the 5 places you must do it

徐行 means driving at a speed at which you can stop immediately (Road Traffic Act Art. 2). The law gives no number in km/h.

The places are set by Art. 42. Common traps: a steep uphill slope is NOT on the list (only near the top of an uphill slope and steep downhill slopes are), and you must slow down near a bend even with a clear view. Intersections count only when the view to the left and right is blocked, and not when traffic there is controlled (for example by signals) or when you are on a priority road.

Stopping distance, braking distance and reaction distance

The distance covered from noticing danger until the brakes start to work is the free running (reaction) distance (空走距離); from when the brakes work until the car stops is the braking distance (制動距離); together they make the stopping distance (停止距離). A question calling the brakes-to-stop distance the "stopping distance" is FALSE.

Braking distance and centrifugal force rise with the square of speed: double the speed means about 4 times, triple means about 9 times. "Double the speed, double the braking distance" is FALSE.

Wet roads and worn tires lengthen the braking distance. Reaction distance depends on the driver's reaction time, so fatigue or alcohol lengthens it. NEXCO West Japan says that at 100 km/h on a dry road you need about 100 m of following distance, and about twice that on wet roads or with worn tires. On snow or ice, keep an even longer gap.

Commonly mistaken patterns

Speed questions mostly take a correct number and attach it to the wrong vehicle or place. Learn these patterns.

• A large motorcycle's statutory limit on ordinary roads is 30 km/h → FALSE (motorcycles are motor vehicles: 60 km/h; 30 km/h is for mopeds)
• A moped may go 40 km/h where a 40 km/h sign is posted → FALSE (mopeds are capped at 30 km/h)
• Towing a broken-down car with a rope: statutory limit 40 km/h → FALSE (30 km/h in principle; 40 km/h only when a vehicle of 2,000 kg or less is towed by one at least 3 times heavier)
• Rope towing: keep within 5 m and tie a white cloth to the rope → TRUE (per the explanation in our question data)
• A steep uphill slope is a place where you must slow down → FALSE
• Every ordinary road without a posted limit is 60 km/h → from Sept 1, 2026, roads without a center line are 30 km/h

Lock in the numbers with a mock test

The knowledge test has 50 questions in 30 minutes, and you need at least 45 correct. Speed questions are easy points once you know the numbers, so keep the table above handy and practice the "swapped number" patterns with menkyopass's mock test in English.

Practice questions on this topic

• On ordinary roads with a center line or marked lanes where no maximum speed is set by signs or markings, the statutory maximum speed for motor vehicles is 60 km/h.
• The statutory maximum speed for motorized bicycles (mopeds) is 30 km/h.
• On ordinary roads with a center line or marked lanes and no speed limit sign, the statutory maximum speed for large motorcycles is 30 km/h.
• On a road where signs set the maximum speed at 40 km/h, a motorized bicycle (moped) may go up to 40 km/h.
• As long as you stay within the statutory maximum speed, you may drive at that speed regardless of road and traffic conditions.
• On ordinary roads, there is no minimum speed rule unless one is set by signs or similar.
• When towing a broken-down car with a rope, the statutory maximum speed on ordinary roads is 40 km/h.
• When towing a broken-down car with a rope, you must keep a safe gap of no more than 5 meters between the two cars and attach a white cloth to the rope.
• If your speed doubles, your braking distance also roughly doubles.
• The centrifugal force acting on a car in a curve grows in direct proportion to its speed.
• Stopping distance means the distance the car travels from the moment the brakes start to work until it comes to a stop.
• On a road wet with rain and with worn tires, both the free running (reaction) distance and the braking distance become at least twice as long.
• On rainy days, visibility is poor and the braking distance is longer, so it is good practice to keep about twice the following distance you would keep on a clear day.
• On snowy or icy roads, it is good practice to keep a following distance about 3 times what you would keep on a clear day.
• A steep uphill slope is a place where you must slow down (to a speed at which the vehicle can stop immediately).
• Near a bend in the road, you must drive slowly enough to stop immediately, even when you have a clear view.

FAQ

Related guides

• Japan Expressway Rules: Max 100, Min 50 km/h, Who Can't Enter
• Overtaking Rules in Japan: No-Overtaking Zones and Passing
• Japanese Road Signs: Common Mistakes in the Conversion Test
• How to Study for Japan's License Conversion Knowledge Test

Sources (in Japanese)

• e-Gov法令検索「道路交通法」（第2条・第22条・第42条）
• e-Gov法令検索「道路交通法施行令」（第11条・第12条・第27条・第27条の3。令和8年9月1日施行版）
• e-Gov法令検索「道路標識、区画線及び道路標示に関する命令」（別表第一「最高速度（323）」）
• 警察庁「生活道路の法定速度が30km/hになります（令和8年9月1日施行）」
• 警察庁「交通の方法に関する教則の一部を改正する件（令和8年国家公安委員会告示第32号）」
• 大阪府警察「生活道路の法定速度が30km/hに」
• NEXCO西日本「高速道路の走行ルール」（車間距離の目安）