Why do professionals in this field avoid the word "accident"? ANSWER: because it implies an unforeseeable event caused by bad luck. 1. "Accident" suggests nothing could have been done. 2. Something that cannot be prevented does not receive a budget, a policy or a programme — it receives sympathy. 3. But injuries CLUSTER predictably: same roads, same hours, same age groups, same missing helmet, same unfenced water. 4. Predictable events can be studied epidemiologically like any other disease — and therefore reduced. Hence the field is called INJURY PREVENTION.

Using Haddon's matrix, propose interventions to reduce deaths from motorcycle crashes. ANSWER: address all three phases. BEFORE (prevent the crash) Road design separating fast and slow traffic; speed control; licensing and training; alcohol enforcement; vehicle maintenance; visibility and lighting. DURING (reduce energy reaching the body) HELMETS above all; crash barriers instead of rigid roadside objects; protective clothing. AFTER (reduce the consequences) Bystander first aid training; ambulance access and response time; trauma care capability at the receiving hospital; rehabilitation. EXAM TECHNIQUE: this three-phase structure produces a complete answer for ANY injury topic — road, burns, drowning, occupational — without memorising separate lists.

Why do educational campaigns alone usually underperform compared with engineering or legislative measures? ANSWER: because education is an ACTIVE intervention. ACTIVE Requires the individual to act correctly EVERY TIME. Depends on attention, motivation and memory — all of which fail when people are tired, rushed, drunk or distracted. Those are exactly the circumstances producing injuries. PASSIVE Protects without anyone having to remember: divided carriageways, speed humps, child-resistant containers, fenced wells, guarded machinery. Passive protection asks nothing of the individual, so it reaches everyone — including the careless and the exhausted. SAME PRINCIPLE AS: salt iodisation and clean water supply.

Who bears most road traffic deaths in many low- and middle-income countries, and what follows from that? ANSWER: VULNERABLE ROAD USERS — pedestrians, motorcyclists and cyclists, i.e. people outside a protective shell, rather than car occupants. WHAT FOLLOWS: 1. Interventions aimed only at vehicle occupants (seatbelts, airbags) miss the majority of deaths. 2. Road design that optimises vehicle flow while providing no footpath, crossing or separated lane produces exactly these injuries. 3. Helmets, separation of traffic types, and speed control in populated areas are the measures that reach the people actually dying.

Why is speed described as the "master variable" in road injury? ANSWER: because it acts in BOTH of the first two Haddon phases. BEFORE Higher speed shortens the time available to perceive a hazard and react, and lengthens the stopping distance — so it decides whether a collision happens at all. DURING Kinetic energy rises with the SQUARE of velocity, so the energy delivered to the body climbs steeply with speed. CONSEQUENCE: modest reductions in speed produce disproportionately large reductions in death, which is why speed management is the highest-yield road safety intervention.

A government introduces a helmet law but road deaths change little. Why might that be? ANSWER: because a law without ENFORCEMENT changes behaviour very little. Legislation raises compliance where enforcement is real and visible. Where enforcement is absent, compliance decays quickly and the law becomes symbolic. ALSO CONSIDER: - Helmet QUALITY and correct fastening (an unfastened helmet does not protect). - Whether the law covers pillion passengers. - Whether affordable helmets are actually available. EXAM TECHNIQUE: whenever you propose a legislative intervention, say how it will be enforced. That is what completes the answer.

Why is drowning in young children described as silent, and what follows for prevention? ANSWER: there is usually NO shouting or splashing, and it happens in seconds — a small child can drown in very shallow water. CONSEQUENCE: "supervise the child closely" is an ACTIVE measure and will fail, because supervision lapses for entirely ordinary reasons. WHAT WORKS INSTEAD (passive): barriers and fencing around wells, tanks and ponds; covering water containers; emptying buckets after use. HOUSEHOLD HAZARDS: buckets, water tanks, irrigation channels and unfenced wells — not only rivers and lakes.