Japan Highway (Expressway) Driving: Rules, Tolls, and Tips

Japan's expressway (kosokudoro) network stretches across the entire country and is essential for long-distance travel by car. However, expressway driving in Japan comes with a unique set of rules, a toll system, and conventions that differ from freeways and motorways in other countries. This guide covers everything you need to know, both for the gaimen kirikae written test and for real-world expressway driving.

Speed Limits on Expressways

The default speed limit on Japanese expressways is 100 km/h. However, there are important variations:

• Maximum speed: 100 km/h (some designated sections allow 120 km/h, posted with signs)
• Minimum speed: 50 km/h. Driving below this speed (except in traffic congestion, adverse weather, or emergencies) is a traffic violation
• Large vehicles: Trucks and buses may have a lower maximum of 80 km/h on certain sections
• Mopeds and 125cc vehicles: Prohibited from expressways entirely. Only vehicles capable of maintaining the minimum speed are permitted
• Learner drivers: Drivers with a provisional licence are prohibited from using expressways
• Construction zones: Temporary speed reductions (often 50-80 km/h) are strictly enforced

Speed enforcement on expressways uses both fixed cameras (N-system, orbis) and unmarked patrol cars. Fines are proportional to the excess speed and can result in licence points or suspension. See our Speed Limits topic for related practice.

The Toll System

Unlike most Western countries where freeways are free, nearly all Japanese expressways charge tolls. The cost is calculated based on distance travelled and the type of vehicle.

ETC (Electronic Toll Collection)

The ETC system is the standard way to pay tolls in Japan. It works using a small card reader mounted on the dashboard and an ETC card issued by a credit card company or bank.

• Setup: You need both an ETC on-board unit (OBU) installed in your vehicle and a valid ETC card. The OBU must be professionally registered to your vehicle
• How it works: As you approach a toll gate, drive through the ETC lane at 20 km/h or below. The barrier opens automatically and the toll is charged to your ETC card
• Discounts: ETC users receive significant discounts, including late-night discounts (30% off between midnight and 4 AM), weekend discounts, and frequent-use loyalty programs
• Without ETC: Use the general (ippan) toll lane and pay with cash or credit card at the booth. This costs more (no discounts) and adds time

Toll Calculation

Tolls are based on distance and vehicle class:

• Kei cars: Lowest rate (approximately 20% less than standard vehicles)
• Standard cars: Base rate (approximately 25 yen per km plus terminal charges)
• Medium trucks: Higher rate
• Large trucks/buses: Highest rate

As an example, a standard car trip from Tokyo to Osaka on the Tomei/Shin-Tomei Expressway (approximately 500 km) costs around 10,000-12,000 yen one way without discounts. ETC discounts can reduce this by 30% or more during off-peak hours.

Merging and Lane Discipline

Merging onto Japanese expressways follows a specific protocol that is tested on the written exam:

• Acceleration lane: Use the full length of the acceleration lane to match the speed of expressway traffic before merging. Do not stop in the acceleration lane unless traffic is completely backed up
• Mirror and head check: Check your right mirror and perform a right shoulder check before merging. Signal right
• Zipper merge: Japanese drivers follow a strict alternating merge pattern (one from the main lane, one from the merge lane)
• Keep left: Unless overtaking, stay in the left lane. The right lane is for passing only. Cruising in the right lane is a violation and can result in a fine
• Exiting: Move to the left lane well before your exit. Signal left and decelerate in the deceleration lane, not on the main expressway

Service Areas (SA) and Parking Areas (PA)

Japanese expressway rest stops are well-maintained and spaced every 50-80 kilometres. There are two types:

• Service Areas (SA): Full-service facilities with petrol stations, restaurants, food courts, convenience stores, toilets, showers (some), and often local specialty shops. Major SAs can be tourist destinations in their own right
• Parking Areas (PA): Smaller facilities with toilets, vending machines, and limited food options. Some PAs have convenience stores
• Highway Oasis: Some SAs connect to adjacent commercial facilities or parks accessible only from the expressway

Rest stops are strongly recommended on long journeys. Japanese law and driving guidance emphasise taking a break every 2 hours of driving. Driver fatigue is taken seriously — there are signs reminding you to rest, and some SAs have napping facilities.

Emergency Procedures on Expressways

Breakdowns and emergencies on expressways require specific actions. This section is frequently tested on the gaimen kirikae exam.

Breakdown Procedure

• Move to the shoulder: If possible, pull completely off the main lanes onto the hard shoulder or emergency stopping area
• Turn on hazard lights: Activate immediately to warn approaching traffic
• Place a warning triangle: Set up the reflective triangle at least 50 metres behind your vehicle on the shoulder. This is legally required on expressways
• Get behind the guardrail: All occupants should exit the vehicle from the left side (away from traffic) and stand behind the guardrail. Never stay inside a stopped vehicle on the expressway — rear-end collisions with stopped vehicles are a major cause of expressway fatalities
• Use the emergency phone: Roadside emergency phones are located every 1 km on expressways. They connect directly to the expressway management centre. You can also call the Japan Road Service (JAF) at #8139

Accident Procedure

• Call 110 (police) and 119 (fire/ambulance) if there are injuries
• Move vehicles off the main lanes if possible to prevent secondary accidents
• Place warning triangles and turn on hazard lights
• Get all persons behind the guardrail
• Use the emergency phone to notify the expressway management centre

Weather and Expressway Closures

Japanese expressways are subject to weather-related restrictions and closures:

• Snow and ice: Winter tyre or chain requirements are enforced on northern and mountain expressways. Electronic signs indicate when chains are mandatory. Studless winter tyres are accepted in most areas; some extreme sections require physical chains
• Typhoons: Expressway sections may be closed during typhoons due to high winds and flooding. Check NEXCO road information before departing
• Heavy rain: Speed limits may be temporarily reduced. Visibility under 50 metres triggers mandatory speed reductions
• Fog: Some mountain expressways experience dense fog. Fog lights and reduced speed are essential. Highway patrol may close sections

Expressway Etiquette

Beyond the formal rules, there are conventions that Japanese drivers follow on expressways:

• Hazard light thanks: When a truck or large vehicle lets you merge, flash your hazard lights 2-3 times as a thank you. This is universal in Japan
• Left-lane discipline: Stay in the left lane unless actively overtaking. This is both a legal requirement and a strongly followed convention
• Smooth merging: Match speed before entering the main lane. Stopping at the end of the acceleration lane disrupts traffic flow
• Following distance: Maintain adequate following distance, especially at higher speeds. The recommended distance is the speed in metres (at 100 km/h, maintain 100 metres)
• Headlight flashing: A flash of headlights from the vehicle behind you in the right lane is a request for you to move left so they can pass. It is not aggressive — it is standard expressway communication

Expressway Rules for the Written Test

Common test questions about expressways include:

• "The minimum speed on expressways is 50 km/h" — TRUE
• "Mopeds can use expressways if they travel at 50 km/h or more" — FALSE (mopeds are completely prohibited)
• "In a breakdown, you should stay in your vehicle until help arrives" — FALSE (exit and get behind the guardrail)
• "You must place a warning triangle when stopped on an expressway" — TRUE
• "The default maximum speed on expressways is 120 km/h" — FALSE (it is 100 km/h; 120 km/h only on designated sections)
• "Learner drivers may use expressways if accompanied by an experienced driver" — FALSE (learner drivers are prohibited entirely)

Key Takeaways

• Default expressway speed: 100 km/h max, 50 km/h minimum
• Almost all expressways are toll roads — ETC is the cheapest and fastest payment method
• In a breakdown: hazard lights, warning triangle 50m back, all persons behind the guardrail
• Mopeds and learner drivers are prohibited from expressways
• Service Areas every 50-80 km — take breaks every 2 hours
• Keep left unless overtaking — right lane is for passing only
• Emergency phones every 1 km; JAF roadside assistance at #8139