7.2 Mandatory Regulatory Signs

Mandatory signs: the law that tells you what to do

Section 7.1 taught the forbid language of red-border circles. Section 7.2 teaches the command language of blue circles. The Nigerian Highway Code is unambiguous: regulatory signs with blue circles but no red border are mandatory signs. They give positive instructions and are still regulatory — not optional decoration.

Quick Answer: A mandatory sign is typically a circular blue disc with a white symbol. It means you MUST follow the instruction (direction, lane behaviour, minimum speed, use of a track, and similar commands). Contrast: a red-border circle means you MUST NOT do the action shown. Mixing these two families is one of the most common FRSC CBT errors on road-sign items.

On Nigerian roads you will see blue mandatory plates at diversions around works, one-way systems in city centres, roundabout approaches, and special cycle or pedestrian tracks. The CBT will show a symbol and ask whether you must, must not, or may act. Train your eye on blue = must.

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Shape and colour keys (mandatory)

Why “positive instruction” matters in stems

Exam writers sometimes ask: “What kind of instruction does a blue circular regulatory sign give?” The Code-aligned answer is a positive instruction (something you are required to do), not a hazard warning and not a tourist information board. Information signs are usually rectangular (Chapter 8).

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Direction, diversion, one way, and roundabout

These are the backbone of urban CBT scenarios.

One way and “no entry” working as a pair

In real streets, a one-way mandatory layout is often reinforced at the wrong end by a no entry prohibitory sign. Mentally link them:

• Entering against the one-way is both a mandatory failure and usually a no-entry / restricted-road offence pattern.
• The FRSC offence list includes using a restricted road marked “one way” or “no entry.”

For Section 7.2, if the stem shows the blue one-way control, the correct behaviour is to proceed only with the permitted flow.

Diversion vs “I know a shortcut”

Diversion means the authority has prescribed a temporary path. Cutting cones, driving the closed carriageway, or inventing a counter-flow shortcut is not compliance. End diversion tells you the special path requirement is finished — it does not authorise reverse driving or ignoring the next mandatory plate.

Scenario A. Works close the main approach in Abuja. A diversion sign and arrow route traffic via a service road. Tunde follows the diversion. Emeka drives through a gap in barriers “because GPS still shows the main road.” Emeka fails the Code standard; Tunde matches the mandatory instruction.

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Keep right, pass either side, priority, and two-way layouts

Why “two-way ahead” is a mandatory teaching item

Drivers who have been on a dual carriageway or one-way system can forget that opposing traffic is about to reappear. The two-way / multi-lane two-way ahead family forces a mindset shift: watch for oncoming vehicles, adjust lane choice, and do not treat the next stretch like a one-way flyover.

Keep right vs pass either side

• Keep right removes choice: the right-hand side of the feature is required.
• Pass either side restores choice of side but not choice to ignore the obstacle control or to drive unsafely.

Scenario B. A central island has keep right. Ada passes left of the island because “it looked empty.” That violates the mandatory instruction even if no crash occurs.

Scenario C. A bollard island shows pass either side. Either side is permitted; weaving without observation is still unsafe — mandatory permission is not a licence for careless driving.

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Compulsory tracks and minimum speed

Minimum speed vs maximum speed (exam contrast table)

CBT trap: choosing “40” as a minimum when the plate is a maximum, or treating a blue minimum as “you may never stop for a red light.” Traffic lights and officers still control junctions (Section 7.3). Minimum-speed signs do not authorise entering a blocked junction or running a red.

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Temporary traffic control and sign for temporary schemes

The Code list includes sign for temporary traffic control. Temporary schemes may combine:

• Blue mandatory direction/diversion plates.
• Prohibitory closures and no-entry plates.
• Officer or marshal direction (Section 7.3).
• Orange works context and reduced speeds (linked to Chapter 6 enforcement and Chapter 8 warnings).

Rule for CBT and roadside: temporary does not mean optional. A temporary mandatory arrow is still a must-follow positive instruction while the scheme is active.

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Master contrast table: prohibitory vs mandatory

Use this table until recognition is automatic:

Scenario D. A blue roundabout sign faces Funke. She must treat the junction as a roundabout control, not as an uncontrolled crossroads. Ignoring priority and “cutting” the circle violates the mandatory layout.

Scenario E. A red-border no U-turn faces Kunle at a median break. A blue direction to be followed further on requires a prescribed path to reverse direction legally. Kunle must not U-turn at the ban; he must follow the later mandatory route if that is the prescribed way.

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Offence and enforcement link (without dumping the full fine table)

The Highway Code / FRSC offence framework treats it as an offence to disobey or disregard road signs or pavement markings and to use roads marked one way or no entry improperly. Section 7.2’s practical message:

• Mandatory signs are road signs you can be punished for ignoring.
• They sit beside traffic light obedience (Section 7.3) and marshal obedience.
• “I did not understand the blue plate” is another form of ignorance is no excuse thinking from Chapter 6.

Study drill: blue-disc sentences

1. Blue disc = must.
2. Red ring = must not.
3. One way = one direction only.
4. Diversion = follow the temporary path.
5. Keep right = right side of the feature.
6. Pass either side = choice of side, not choice to ignore.
7. Minimum speed ≠ maximum speed.
8. Two-way ahead = expect oncoming traffic.

Link forward

Section 7.3 adds traffic lights, flashing signals, and traffic warden/marshal hand signals. When an authorised officer is actively directing traffic, that live control can take priority over the fixed light cycle — but it does not erase your duty to understand mandatory plates when no officer is present. Fixed blue signs still rule the empty junction at 06:00.

Extra practice: one-way + no-entry mental model

Picture a city street marked one way toward you legally:

• At the legal entry, blue one way / direction controls confirm the permitted flow.
• At the illegal entry, a red-border no entry (or related closure) blocks wrong-way access.

If a CBT stem shows only the blue one way plate and asks your duty, answer with travel only in the permitted direction. If it shows no entry, answer with do not enter. If it shows both ends of the same street, recognise they are paired controls for one restricted road — the FRSC offence list specifically mentions roads marked one way or no entry.

Minimum speed realism

A blue minimum speed does not force you to plough into a market crowd, a red light, or a stalled tanker. Hierarchy on the exam:

1. Safety and superior control (officer, red light, obvious blockage).
2. Posted mandatory/prohibitory plates when they apply.
3. General Code maxima and following-distance rules from Chapter 6.

Choose answers that respect positive instructions without inventing a duty to crash.

Roundabout and filter discipline preview

Mandatory roundabout signing works with junction rules from earlier chapters: approach in the correct lane, yield as required, signal appropriately, and leave at the correct exit. Do not treat a signed roundabout as a four-way free-for-all because “traffic is light.”