Japan Ordinary Licence Theory common mistakes
Japan Ordinary Licence Theory · Understand the traps and how to avoid them.
On 信号無視 questions, treating a yellow light as a cue to speed up and enter the intersection, so the candidate answers that accelerating on yellow is acceptable.
In daily driving many people accelerate to beat the light, and the exam wording often uses a scene where the light has just turned yellow, so habit overrides the rule. Candidates also confuse the rule for yellow with the rule for green.
What to do instead
Memorize the rule precisely: a yellow light means a vehicle must not proceed past the stop line unless it is already too close to stop safely. When a question describes a yellow light at normal approach distance, the correct behaviour is to stop. Drill the three-way distinction between green, yellow, and red with the exact legal wording, not with driving intuition.
At an intersection without a stop line or with an obscured view, answering that the driver may proceed at normal speed because the light is green or because the road is a priority road.
Candidates learn signal and priority rules as separate facts and do not apply the overriding duty to confirm safety. Exam questions often add a hidden hazard such as a parked truck or a child, and the candidate answers on the signal alone.
What to do instead
Adopt a rule of thumb for the exam: whenever a question adds a visibility obstruction, a crossing pedestrian, or a blind side road, the safe answer is to slow down and confirm safety even on a green light or priority road. Treat any described hazard as changing the correct answer, and practise questions that combine signal, priority, and hazard in one scene.
Misreading 標識 and 標示 questions by confusing a regulatory sign with a warning sign, or confusing a painted road marking with a sign that has the same shape or colour.
Signs are learned as a list of images rather than by category, and painted markings (such as a no-parking line or a zebra crossing) are studied separately from signs, so the candidate cannot classify an unfamiliar item. The exam also uses near-identical pairs such as no stopping versus no parking.
What to do instead
Learn by classification: blue circles are generally mandatory instructions, red circles are prohibitions, yellow diamonds are warnings, and painted markings follow a separate set. Build a comparison table for the confusable pairs (no stopping versus no parking, maximum speed versus minimum speed, no entry versus one-way) and test yourself by recalling the meaning from the shape and colour alone.
Answering that the driver need not check the left rear blind spot before changing lanes on an expressway because a mirror check is sufficient.
Mirrors leave a blind spot, and in ordinary driving many people rely on mirrors alone. Exam questions describe a lane change where a motorcycle is in the blind spot, and candidates answer based on the mirror only.
What to do instead
Fix the sequence in memory: mirror, signal, then a direct look over the shoulder to confirm the blind spot, then move. Any question describing a lane change or a merge should trigger the shoulder check as part of the correct answer, and any answer that relies on mirrors alone should be treated as wrong.
Underestimating stopping distance by answering that a vehicle travelling at twice the speed needs twice the braking distance, or that reaction distance does not count.
Candidates memorize the formula loosely and forget that braking distance rises with the square of speed, and that reaction distance is added before braking begins. The exam phrases this as a comparison between two speeds or between a dry and a wet road.
What to do instead
Memorize two facts: total stopping distance equals reaction distance plus braking distance, and braking distance is proportional to the square of speed. So doubling speed roughly quadruples braking distance. Practise questions that compare speeds or road surface conditions, and always add reaction distance explicitly before choosing an answer.
On 車両知識 questions, answering that the driver may continue driving with a warning light on, or confusing which tyre or brake condition is a legal defect versus a comfort issue.
Candidates study vehicle knowledge as maintenance trivia rather than as legal duties, so they do not connect a defect to the obligation to stop driving. Warning lamps and tyre wear limits are also easily confused with each other.
What to do instead
Group vehicle knowledge under the duty to drive a safe vehicle: learn the specific legal limits (such as the tyre tread depth and the meaning of each warning lamp) and the rule that a vehicle with a defect affecting safety must not be driven. For each warning lamp, memorize the required action, not just the name.
In accident-response questions, answering that the driver may leave the scene to report the accident later, or that helping an injured person is optional if an ambulance has been called.
Candidates confuse the civil and criminal consequences with the legal duties at the scene, and they underestimate the duty to rescue and the duty to report. The exam tests the order and the mandatory nature of these duties.
What to do instead
Memorize the mandatory duties in order: stop the vehicle, prevent further danger, rescue and aid injured persons, and report to the police. Treat any answer that allows leaving the scene before these are done as wrong. Practise scenario questions where the candidate must identify which duty applies first.
Confusing the penalty points and administrative sanctions attached to a violation, or answering that a licence suspension and a licence revocation are interchangeable.
The points system, the suspension thresholds, and the revocation grounds are a large set of numbers and categories, and candidates learn them without a structure. The exam uses realistic point totals and asks for the resulting administrative action.
What to do instead
Build a small decision table: cumulative points within a period, the thresholds that trigger suspension, the grounds for revocation, and the separate treatment of serious violations. Learn the categories rather than isolated numbers, and practise converting a described violation into points and then into an administrative outcome.
On 免許制度 questions, answering that a licence renewal or a change of address can be handled after the deadline, or that a first-time licence holder has the same conditions as an experienced driver.
Administrative deadlines and the special conditions for novice drivers are learned as isolated facts, so the candidate cannot apply them to a described situation. The exam tests the consequences of missing a deadline, not just the deadline itself.
What to do instead
For each administrative procedure, memorize three things: the deadline, the required action, and the consequence of failing to act. Separately memorize the novice-driver conditions and the grounds for suspension. Practise questions phrased as a scenario with a date, so you apply the rule rather than recall the label.
Ignoring eco-driving questions or answering that aggressive acceleration and late braking save fuel, and treating idling as harmless.
Candidates treat eco-driving as common sense and do not study the specific techniques, so they answer from habit. The exam tests concrete behaviours such as smooth acceleration, early release of the accelerator, and avoiding unnecessary idling.
What to do instead
Memorize eco-driving as a short list of concrete behaviours: smooth start and acceleration, maintaining a steady speed, early accelerator release before braking, correct tyre pressure, avoiding unnecessary loads, and stopping the engine during long waits. For each question, ask whether the described behaviour reduces fuel use and emissions, and choose accordingly.