BiH Theory B common mistakes
BiH Theory B · Understand the traps and how to avoid them.
Treating priority-road and stop-sign junctions the same: rolling through a STOP sign after only slowing, or failing to give way at an unmarked intersection by assuming the wider road always has priority.
Candidates memorize sign shapes but never learn the underlying rule hierarchy, so under time pressure they fall back on intuition ('the bigger road feels like the main road') instead of the actual right-of-way rule.
What to do instead
Build a one-page decision tree for intersections: STOP = full stop, then yield; yield sign = give way without stopping if clear; unmarked = give way to traffic from the right; priority road = you have right-of-way but must still anticipate. Drill 20 junction scenarios aloud, stating the rule before the action.
Misreading traffic-light combinations, especially flashing amber, a green light with a pedestrian still crossing, or a green arrow alongside a red circle, and proceeding when the movement is not actually permitted.
Candidates learn lights as isolated symbols rather than as a system, and they underestimate how often exam questions combine a light with a marking, a sign, or a police officer's signal.
What to do instead
Study lights in combination: red+green arrow, flashing amber, dark signals, and the rule that a police officer's signals override lights, which override signs, which override markings. Practice ranking the four control types for 15 mixed scenarios until the hierarchy is automatic.
Ignoring lane markings and road-edge lines when positioning for a turn or a lane change, e.g. crossing a solid centre line to overtake or drifting over a bike lane before turning right.
In real driving the markings are often faded, so candidates stop scanning for them and rely on other vehicles' behaviour; the exam then tests markings they have stopped noticing.
What to do instead
Adopt a scanning routine that names the marking type out loud while driving: 'solid centre line, no crossing; broken line, overtaking permitted if safe; bike lane, check mirror before right turn.' Review the standard marking set (solid, broken, double, edge, hatched areas) once a week with a self-drawn diagram.
Following too closely in rain or at night and failing to adjust speed to visibility, so the stopping distance exceeds the visible road ahead.
Candidates calibrate following distance on dry daytime roads and never convert the two-second rule into wet or night conditions; they also confuse reaction distance with braking distance.
What to do instead
Memorize the arithmetic: total stopping distance = reaction distance + braking distance, reaction distance grows with speed and fatigue, braking distance roughly quadruples when speed doubles and lengthens on wet or icy surfaces. Practice the two-second gap and double it in rain, and state the visible-stop-distance rule: never drive faster than you can stop within the distance you can see to be clear.
Failing to check blind spots and mirrors in the correct sequence before changing lanes, turning, or opening a door, and relying on mirrors alone.
Mirrors feel sufficient and a shoulder check feels awkward, so candidates skip it; they also check mirrors too early and then act seconds later when the situation has changed.
What to do instead
Use a fixed sequence every time: mirror, signal, shoulder check, manoeuvre, and re-check before committing. For exiting the vehicle, use the far-hand door technique so the body rotates and the blind spot is seen. Rehearse the sequence until it is a habit rather than a remembered step.
Underestimating vulnerable road users: passing a cyclist too closely, not yielding to pedestrians already on a crossing, or missing a child or elderly pedestrian stepping out from between parked cars.
Candidates judge safety by their own reaction time and assume others will behave predictably; they also treat a pedestrian waiting at a crossing as 'not yet crossing' and keep going.
What to do instead
Learn the specific obligations: give cyclists a wide lateral clearance, slow before crossings and be ready to stop for anyone waiting or already on it, and scan between and under parked vehicles for feet and shadows. Practice naming one hazard per parked car in a residential street during lessons.
Misjudging the effect of alcohol, fatigue, medication, or distraction and believing coffee, fresh air, or a short break restores fitness to drive.
Candidates underestimate how quickly fatigue impairs reaction time and overestimate willpower; they also treat the legal alcohol limit as a safety threshold rather than an upper bound.
What to do instead
Learn the facts: fatigue impairs reaction and judgement before the driver notices it, only sleep restores alertness, alcohol impairs from the first drink and the only safe amount before driving is none, and some medicines carry explicit driving warnings. Plan breaks, avoid driving during usual sleep hours, and treat any drowsiness as a signal to stop, not to open a window.
Answering technical questions from folklore rather than specification, e.g. claiming tyre tread depth is adequate when it is at the legal minimum, confusing coolant and brake fluid reservoirs, or not knowing what a warning light means.
Candidates learn maintenance by watching others and never check the handbook or the legal minimums, so worn tyres, low pressure, and illuminated warning lights are normalized.
What to do instead
Memorize the checkable numbers and symbols: legal minimum tread depth and the tread-wear indicator, correct cold tyre pressures from the door pillar or handbook, the difference between coolant, oil, washer, and brake fluid caps, and the meaning of red versus amber dashboard warnings. Walk around the car weekly checking tyres, lights, and fluids, and read the warning-light page of the handbook once.
Giving first aid in the wrong order at a crash scene: moving an injured casualty, forgetting to secure the scene and call emergency services, or starting CPR without checking responsiveness and breathing.
Panic and the wish to 'do something' push candidates to act before assessing; they also do not know the local emergency number or what to say when it answers.
What to do instead
Learn the fixed order: protect the scene and yourself, alert emergency services with location, number of casualties, and hazards, then assess responsiveness and breathing, then act. Do not move a casualty unless there is immediate danger such as fire. Practice the emergency call script and the recovery position, and know that CPR starts only for an unresponsive casualty who is not breathing normally.
Not knowing which documents must be carried and which obligations apply after a collision, an offence, or a change of vehicle, and mixing up penalty points, fines, and licence withdrawal.
Candidates treat paperwork as administrative trivia and study it last, so the distinctions blur under exam pressure; they also rely on second-hand claims about penalties.
What to do instead
Build a short table with three columns: document, when it must be produced, and the consequence of failing to produce it. Add a second table for collision duties (stop, secure the scene, exchange details, report when required) and for penalty categories. Review the table from the official current regulations rather than memory, and check the effective date of any rule you cite.