9.2 Rain, Night, Dust & Adverse Conditions

Special conditions are not rare events

The Nigerian Highway Code (Section D — Driving under Special Conditions) groups situations that sharply raise risk: night driving, driving in the rain, harmattan haze, misty/foggy weather, and driving in a convoy. Defensive SIPDE from Section 9.1 still applies — but Search becomes harder, Predict must allow longer stopping distances, and Execute often means slow down early rather than thread a clever gap.

Quick Answer: In rain, expect longer stopping distance, use lights and wipers, watch for aquaplaning, and slow down. At night, use headlights correctly (not parking lights alone), dim for oncoming traffic, avoid dazzle wars, and fight fatigue. In dust / harmattan / fog, reduce speed, increase gap, use appropriate lights (and hazards when the Code’s poor-visibility guidance applies), and park safely off the road if you cannot see. Failing to use headlights in inclement weather appears on FRSC offence-style lists — lights are a legal and safety duty, not fashion. Watch for animals and unmarked hazards on Nigerian roads.

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Night driving — why the Code discourages it

Night means driving when it is dark. The Code discourages night journeys because:

• The road user cannot see far ahead unlike in daylight.
• In an emergency, help is not readily available.
• Security is uncertain.
• The driver may easily fall asleep.

Precautions before you accept a night trip

• Avoid night journeys when you can plan otherwise.
• Plan the journey ahead (route, fuel, rest points, alternative if weather collapses).
• Ensure the vehicle is in good condition (lights, wipers, tyres, brakes — parade discipline from Chapter 3).
• Ensure the driver is healthy.
• Do not drive under the influence of drug or alcohol (expanded in Chapter 10).

What to do while driving in the dark

“Half speed” is a Code safety instruction for darkness, not a new legal speed table replacing Chapter 6. On the CBT, if a stem asks night behaviour, prefer large speed reduction and correct headlamp use over “maintain 100 because the expressway allows it.”

If you are dazzled by an oncoming high beam

The Code’s dazzle protocol is high-yield:

1. Do not do the same (no retaliatory full beam fight).
2. Avoid looking directly at the bright lights.
3. Slow down and keep an eye on the right side of the road (Nigeria’s right-hand traffic geometry).
4. Stay close to the right side of the road.
5. Look quickly ahead intermittently to judge the other vehicle’s position until you have passed.
6. At best, stop until the vehicle with dazzling lights passes you.

Exam trap: answering “flash your own high beam harder” fails the Code.

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Driving in the rain

Rain means driving when rain is falling. Surfaces become wet and slippery. Link this section to Chapter 6.3: overall stopping distance increases greatly on wet roads; the two-second rule should stretch toward three or four seconds (“Playing it Safe!” / “Safer and Sane”).

Rain defence package

• Slow down — friction is down; aquaplaning risk is up.
• Increase following distance — thinking and braking both suffer when spray hides brake lights.
• Lights on so others see you in spray and grey light.
• Wipers on and effective; if they smear, fix them before a long trip.
• Smooth inputs: gentle braking and steering reduce skids on painted lines, metal plates, and oily first-rain films.

Aquaplaning (hydroplaning) risk

When a wedge of water lifts the tyre off the asphalt, steering and braking feel light or dead. Contributing factors include speed, worn tread, standing water, and under-inflation. Defence:

• Slow before deep water, not inside a panic swerve.
• Hold the wheel steady; ease off the accelerator; avoid harsh braking while fully afloat on water.
• After water, test brakes gently when safe — wet drums/discs may need a careful dry-out application.

CBT logic: rain answers almost always include reduce speed + more space + visibility equipment, never “speed up to clear the wet zone faster.”

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Harmattan haze, mist, fog, dust, and storms

The Code groups harmattan, mist, fog, strong wind, dust, thunderstorms, and related conditions. Visibility collapses; dust can sandblast sightlines on intercity roads; fog turns headlights into glare walls if misused.

What to do under these conditions (Code list)

• Put on your wipers (rain/mist mix; also clear light dust film when appropriate).
• Reduce your speed.
• Ensure the demister is functional (clear windscreen fogging).
• Put on your headlights.
• Dim headlights in order to see and be seen (full beam can bounce back at you in fog/dust).
• Put on hazard lights when the Code’s poor-visibility guidance calls for making yourself conspicuous.
• If visibility is poor, move off the road and park safely.
• Leave parking lights on when stopped off-road as directed.
• Keep a safe distance from the vehicle in front.

Headlights in inclement weather — offence context

FRSC CBT and offence-style materials treat failure to use headlights in inclement weather as a listed compliance failure. For study purposes:

• Lights are not optional fashion accessories when rain, haze, or fog cut contrast.
• “I can still see a bit” is not a defence if the law and safety practice require you to be seen.
• Pair this with night rules: parking lights alone are not a substitute for headlamps when moving.

Exact naira fine tables belong with Chapter 11 offence codes; Section 9.2 locks the behaviour: use headlights when weather is inclement.

Dust and harmattan specifically

• Dust plumes behind trucks can erase the vehicle ahead for seconds — increase gap before you enter the cloud.
• Harmattan haze can make daytime feel like dusk; start light discipline early.
• Expect longer thinking distance because hazards appear late — slow so SIPDE still has time to work.

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Animals and unmarked hazards on Nigerian roads

The Highway Code special-conditions section focuses on weather and convoy, but FRSC-relevant defensive practice on Nigerian roads must include:

• Livestock (cattle, goats, sheep) drifting onto rural and peri-urban carriageways.
• Dogs and other animals at village edges and refuse points.
• Broken-down vehicles without triangles or with inadequate warning.
• Potholes hidden by rainwater, soft shoulders, and sand drifts after storms.
• Unmarked speed reducers, traders’ goods, and construction spoil.

Defence: search far, identify silhouettes early (especially at dusk), predict sudden lateral movement, decide lower speed and escape path, execute without swerving into opposing traffic. Hitting an animal can kill occupants via loss of control even when the animal is small; large livestock collisions are catastrophic.

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Driving in a convoy

A convoy is a group of vehicles travelling together, often with an escort. The Code’s instructions:

• Obey recommended speed limits.
• Observe common-sense following distance.
• Do not constitute hazards to other road users.
• Drive with attention and total concentration — do not get excited merely because you are in a convoy.
• Avoid behaviours that turn the group into a rolling blockage or racing pack.

Convoy membership is not a licence to tailgate, block both lanes, or ignore traffic controls. SIPDE still belongs to you as an individual driver.

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Integrated scenarios

Scenario A — Night rain on a highway. Private-car highway max may be 80 km/h in dry ideal tables, but night + rain demands far lower speed, full proper headlamps (not parking lights), longer gap, and readiness for dazzle from oncoming traffic.

Scenario B — Harmattan on an intercity stretch. Dimmed headlamps, reduced speed, bigger gap behind trucks throwing dust, willingness to park safely if visibility collapses.

Scenario C — Dazzle. Oncoming full beam: eyes to the right edge line, slow, no revenge beam, stop if needed.

Scenario D — Goat herd near a bend. Search fails if you only watch the road centre; identify early; execute slow approach rather than horn-only aggression at the last second.

Scenario E — Convoy peer pressure. Lead vehicle speeds; you refuse to stack at one-second gaps. Code: following distance and concentration beat “keeping up with the escort” heroics.

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Memory hooks for Section 9.2

1. Night: see and be seen; never parking-lights-only while moving; speed cut hard (Code: at least half).
2. Dazzle: no retaliation; right-side reference; best stop.
3. Rain: slippery + longer stop + aquaplaning risk.
4. Haze/fog/dust: slow, lights, demister, gap; park if blind.
5. Inclement weather: headlights on — offence-relevant compliance.
6. Animals/unmarked hazards: early slow, no hero swerve.
7. Convoy: limits + space + concentration, not excitement.

Link forward

Section 9.3 attacks the hidden special condition inside the driver: fatigue, with the Highway Code rule of 15 minutes rest after every 4 hours and no more than 10 hours driving in 24 hours.

Lights decision tree (exam-friendly)

Rain + following distance callback

If Section 6.3 gave you 92 m overall stopping feel at 100 km/h on a dry idealised table, rain destroys that comfort. Special conditions mean you may need both lower speed and multi-second gaps. Defensive driving without space is only a slogan.