Iran Light Vehicle Driving Theory common mistakes
Iran Light Vehicle Driving Theory · Understand the traps and how to avoid them.
Answering priority questions by memorizing which road type 'usually' has right of way instead of reading the actual intersection geometry and the presence or absence of a priority sign or marking. Candidates choose the main road, the wider road, or the one going straight even when a yield sign (رعایت حق تقدم) stands on their own approach.
Priority in Iranian regulations is fixed by signs and markings at each intersection, not by road width or habit. Learners who study from informal summaries memorize rules of thumb that collapse when the sign on their own approach contradicts them, and under time pressure they fall back on the habitual answer.
What to do instead
For every priority question, first identify what is posted on the driver's own approach (stop, yield, priority road, no sign), then on the conflicting approach. Practice by drawing five sketch intersections and writing the correct order of movement before checking any answer key. Treat 'no sign' as a distinct case that must be reasoned out, not guessed.
Confusing the meanings of the circular regulatory signs that differ only by a red border or a slash, particularly no-entry versus no-passage-in-one-direction, and the blue mandatory signs versus blue informational signs. Candidates pick the sign that looks closest to the described meaning.
These families share shape, colour, and pictogram style, so recognition degrades into visual matching. Many candidates learn signs by name only and never compare the near-identical pairs side by side, so the discriminating detail (border, slash, arrow direction) is never encoded.
What to do instead
Build a two-column comparison sheet of confusable pairs: red circle with white bar versus red circle with single arrow, blue circle with arrow versus blue square with arrow, triangle apex up versus apex down. For each pair write the one visual feature that separates them and the driver action each requires. Test yourself by covering the names and naming the action from the shape alone.
Misreading road markings as advisory decoration, especially continuous versus broken centre lines, hatched areas, and bus-lane or shoulder markings. Candidates treat a solid line as crossable when overtaking looks convenient.
Markings are learned as background to signs rather than as binding rules with their own legal force. Because markings are painted on the surface, they are mentally downgraded below vertical signs, and the solid-line prohibition on crossing is not linked to its purpose of protecting sight distance.
What to do instead
Learn markings by function: which ones prohibit crossing, which permit crossing with conditions, which reserve space for a class of user. For each marking, state the prohibited action in one sentence. When practising, narrate aloud why a solid line exists at that location (crest, curve, junction) so the rule attaches to a hazard rather than to paint.
Treating the safe following distance as a fixed number of metres valid at all speeds, or judging it by eye as 'about two car lengths'. Candidates keep the same gap at highway speed as in town traffic.
Distance is taught as a single memorized figure, so it is not scaled to speed or to conditions. Human estimation of gap is also poor at speed because the visual angle shrinks; the gap feels larger than it is. Fatigue and habit then erode whatever margin was intended.
What to do instead
Use a time-based rule and compute it: at least two seconds in good conditions, doubled in rain, at night, or behind a heavy vehicle that blocks the view ahead. Practise counting seconds past a fixed roadside object during supervised drives. Convert to metres for the exam: at 90 km/h, two seconds is about 50 metres, and the stopping distance behind that gap is far longer than most candidates assume.
Entering a hazard without a plan for the escape route, for example overtaking with no clear view of the road ahead, or approaching a blind crest or pedestrian crossing at a speed that leaves no room to stop. Candidates answer 'slow down' but cannot say what they would do if the hazard materializes.
Hazard-perception questions are read as comprehension tests about danger in general rather than as decisions under uncertainty. Candidates scan for the obvious hazard (the parked car, the child) and stop there, missing the second-order hazard (the oncoming overtaker, the car door opening) that the question is really about.
What to do instead
Adopt a scan routine: look far ahead, then near, then mirrors, then instruments, and for each identified hazard ask 'what if it moves, and where do I go?' Before any overtake, state the abort condition. In practice questions, always name the escape space and the speed that preserves it, not just the presence of danger.
Answering vehicle-inspection items from general impressions, such as 'check the tyres regularly', instead of the specific measurable criteria: minimum tread depth, correct cold tyre pressure per the manufacturer's plate, brake fluid and coolant levels checked when cold, and what a valid periodic inspection certificate requires.
Technical inspection content is studied last and skimmed, so candidates retain the topic but not the thresholds. Many have never personally checked tyre tread or read a pressure plate, so the numbers have nothing to attach to.
What to do instead
Learn the thresholds as numbers with units and practice the checks on a real vehicle: measure tread depth with a gauge, read the door-pillar pressure plate, locate the fluid reservoirs and their min/max marks, and identify the dashboard warning lamps by symbol. Write a one-page pre-drive checklist in your own words and rehearse it until the order is automatic.
In first-aid scenarios, moving an injured motorcyclist or suspected spinal-injury casualty, removing a helmet, or giving food and drink to a casualty, and forgetting to secure the scene and call emergency services before approaching.
The instinct to help physically overrides protocol, and films portray heroic dragging of casualties. Candidates also conflate 'recovery position' with 'sit them up', and do not know that the helmet removal is reserved for a casualty who is not breathing.
What to do instead
Fix the sequence: secure the scene and warn traffic, call emergency services with location and casualty count, then assess. Memorize the do-nots as absolutes: do not move a casualty unless there is fire or traffic danger, do not remove a helmet from a breathing casualty, do not give anything by mouth. Practise the recovery position and bleeding control with direct pressure on a volunteer or manikin.
Applying car rules to motorcycles, or motorcycle rules to light vehicles, at questions about lane position, carrying a passenger, filtering between lanes, and helmet and licence requirements. Candidates assume a motorcycle may use any gap and that a light vehicle may treat a motorcycle as a bicycle.
Motorcycle content is a small slice of the syllabus, so it is under-rehearsed, and everyday observation of filtering riders reinforces the wrong model. The separate licensing categories and passenger-carrying conditions are rarely read in full.
What to do instead
Make a short table with rows for helmet, passenger, lane use, filtering, and licence category, and columns for motorcycle and light vehicle. Fill it from the regulation text, not from observation. Add the interaction rule that matters most for car drivers: give a motorcycle the full width of a lane and never share it during an overtake.
Treating driver ethics and legal responsibility as soft content answered by picking the most polite-sounding option, rather than recalling concrete duties: stopping after a collision, reporting obligations, duties to pedestrians and cyclists, and the consequences of driving without valid insurance or licence.
Ethics questions feel subjective, so candidates answer by tone rather than by rule. Because the wording is often scenario-based, the legally correct answer can sound blunt, and the polite-sounding distractor wins.
What to do instead
Convert ethics into duties with triggers: on a collision, stop, secure, assist, exchange particulars, report. Learn the legal consequences attached to uninsured or unlicensed driving. For scenario questions, ask which option discharges a legal duty, not which sounds kindest, and prefer the option that protects the vulnerable road user when duties conflict.
Misjudging speed and stopping-distance questions by linear intuition, for example assuming that doubling speed doubles stopping distance, and ignoring the split between reaction distance and braking distance.
Braking distance grows with the square of speed, which is counterintuitive. Candidates also forget to add the distance travelled during reaction time, and they under-estimate how much wet or worn tyres extend the total.
What to do instead
Learn the structure, not the table: total stopping distance equals reaction distance plus braking distance, reaction distance rises in proportion to speed, braking distance rises with the square of speed. Work two or three calculations by hand at 30, 60, and 90 km/h, then apply a wet-road multiplier, so the relationship is derived rather than memorized.