6.1 Speed Limits by Road & Vehicle Type

Why speed numbers dominate FRSC CBT items

Speed is one of the easiest topics to mark right — and one of the easiest to mark wrong if you only remember a single “urban is 50” fact. The Nigerian Highway Code (Part Two, Section IX) defines a speed limit as the pace of a moving vehicle at a given time according to traffic law. It is the maximum legal speed a driver may travel on a road under ideal conditions. Limits differ by road type, vehicle type, and environment. A private car, a luxury bus, a laden tanker, and a tow truck on the same stretch of asphalt are not all allowed the same number.

Quick Answer (private car — the Class B pathway most applicants need): 50 km/h in built-up areas, 80 km/h on highways, 100 km/h on expressways. The Code also states that Nigerian law imposes a maximum of 100 km/h for cars on any highway in Nigeria. Taxis and buses share the 50/80 pattern but are capped at 90 km/h on expressways. Tankers and trailers are far slower: 45 / 50 / 60. When conditions are bad, drive below the posted or default maximum — the legal table is a ceiling, not a target.

Nigeria drives on the right-hand side of the road and expresses all official speeds in kilometres per hour (km/h), not miles per hour. Exam stems that smuggle in mph figures are traps.

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What “speed limit” does — and does not — mean

Does mean:

• The highest speed the law allows for that vehicle class on that road category when conditions are good.
• A number you must not exceed, even if other drivers are faster.
• A figure that can be lowered further by posted signs, temporary works, school zones, checkpoints, or enforcement cameras where installed.

Does not mean:

• A minimum you must hit (there is no Highway Code obligation to “keep up at 100” in fog).
• Permission to ignore visibility, traffic density, road surface, load, or tyre condition.
• A free pass to travel at 100 km/h everywhere simply because you drive a private car — built-up and highway columns still apply.

The Code is explicit: common sense often dictates lower speeds. Bad weather, defective roads, construction, markets spilling onto the carriageway, and heavy pedestrian activity all demand slower driving than the table’s maximum.

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Road categories used in the speed table

Before memorising numbers, lock the three columns:

Do not invent a fourth “expressway for cars only at 120” figure — private cars top out at 100 km/h on expressways in the Code table.

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Official Highway Code speed table (km/h)

Memorise this table cold. It is the spine of Section 6.1 and a frequent CBT source.

Private cars (your default Class B numbers)

• Built-up: 50 km/h — city streets, residential areas, village centres.
• Highway: 80 km/h — ordinary highways outside the strict built-up envelope.
• Expressway: 100 km/h — maximum on expressways under the table.

The Code’s narrative also stresses that the law imposes a maximum of 100 km/h for cars on any highway in Nigeria. For exam purposes, treat 100 km/h as the absolute car ceiling in the Highway Code speed framework and never invent 120 km/h “because the road is empty.”

Taxis and buses (easy CBT swap trap)

• 50 / 80 / 90 — same as cars on built-up and highway, but 90 (not 100) on expressways.

If a stem asks the expressway limit for a bus or taxi, 90 km/h is the Code answer. Choosing 100 confuses bus with private car.

Tankers and trailers (heavy articulated risk)

• 45 / 50 / 60 — slower in every column than cars.

The Code specifically notes that articulated vehicles such as tankers and trailers are expected to maintain 50 km/h on highways and 60 km/h on expressways (with 45 in built-up areas). A trailer doing “car speed” on an expressway is both illegal under this table and catastrophically unsafe given mass and stopping distance (Section 6.3).

Motorcycles

• 50 km/h built-up and 50 km/h highway.
• Expressway column is marked “—” (no limit listed in that cell). Motorcycle access to highways/expressways is separately restricted by vehicle size/rules elsewhere in the Code — do not invent a 100 km/h motorcycle expressway figure for CBT.

Tow vehicles

• While towing: 45 km/h on all three road types — flat, conservative cap because of the load and instability of a towed unit.
• While not towing: 50 / 60 / 70 — still below a private car’s highway and expressway maxima.

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Posted limits, construction zones, and “ideal conditions”

The table assumes ideal conditions. Real driving almost never is ideal all day.

Drive lower when:

• Rain, harmattan dust, fog, or night glare cut visibility.
• The road surface is broken, flooded, oily, or under repair.
• You approach markets, schools, churches/mosques at peak times, or areas with many pedestrians and okadas.
• Temporary construction / works signs reduce the effective safe speed.
• Traffic is dense stop-start; braking space is short.
• Your vehicle is heavily loaded or has reduced braking performance.

Posted regulatory speed signs (circular limit signs and related controls) override default expectations when they set a lower maximum. Ignorance of a lower posted limit is not a defence in law (enforcement philosophy continues in Section 6.2). For CBT: if a stem describes a signed 40 km/h zone in a built-up street, you do not answer “50 because the table says 50 for cars.”

Construction and temporary works

Treat works zones as risk multipliers: narrower lanes, loose gravel, workers, and sudden queues. Even if the permanent Code default for that road type is 80 or 100, safe speed may be far lower. Exam logic rewards the candidate who slows for hazards rather than the candidate who recites only the maximum.

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CBT trap map: car 100 vs bus 90 vs trailer 60

Drill these confusions until they feel automatic:

Scenario A. On a dual-carriageway expressway in dry daylight, Ada’s private car may not exceed 100 km/h. A commercial bus beside her is limited to 90. A laden trailer is limited to 60. All three can be “legal” only if each respects its own column.

Scenario B. In a Lagos or Abuja built-up street, private car, taxi, and bus all share 50 km/h as the table maximum — but a tanker is 45, and rain may make even 40 too fast.

Scenario C. Emeka tows a disabled vehicle on a highway and drives at 70 “because he is not a trailer.” Wrong: tow vehicle while towing is 45 km/h everywhere in the table.

Scenario D. Funke memorizes only “cars 100” and answers every speed item with 100. She fails items on built-up streets (50), ordinary highways (80), and all non-car classes.

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Study drill: say the private-car ladder aloud

1. Built-up fifty
2. Highway eighty
3. Expressway one hundred
4. Bus expressway is ninety, not one hundred
5. Trailer expressway is sixty
6. Towing is forty-five flat

If those six lines are automatic, Section 6.1 will carry most pure “what is the limit?” stems. Pair them with condition awareness: the legal maximum is not a command to drive that fast when the road or weather forbids it.

Link forward

Section 6.2 covers speed limiters, cameras, and enforcement mindset (including dangerous driving). Section 6.3 explains why the heavy-vehicle numbers are so low: stopping distance and mass make high speed unforgiving.

Extra practice: mixed-vehicle expressway mental model

Picture one expressway lane group with four vehicles under ideal dry conditions:

If a CBT stem says “which vehicle may lawfully travel fastest on this expressway?” and options are private car, bus, trailer, and towing recovery truck, the private car at up to 100 is the highest legal class maximum — provided conditions remain ideal and no lower posted limit applies.

Built-up vs “I feel safe at 70”

In built-up areas, the table maximum for private cars, taxis, buses, and motorcycles is 50 km/h (tankers 45). Drivers often exceed this in real life; that social habit is not a correct exam answer. The CBT tests Code knowledge, not traffic culture. Choose 50 (or 45 for tankers/trailers) when the stem is clearly built-up and no lower sign is mentioned.

Highway Code definition recap for stems that quote wording

If a question asks what a speed limit is, prefer language close to the Code: the maximum legal speed a driver can travel on a road under ideal conditions, varying by road type, vehicle type, and environment. Answers that call the limit a “recommended average” or a “minimum cruising speed” are wrong.