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Difficulty: HardSmart Motorways and Active Traffic Management

While proceeding through a controlled motorway section, the overhead electronic sign displays flashing amber lights above your lane with a recommended speed of 40 mph. In this situation, what is the legal status and requirement of the displayed signal?

  1. A
    It sets a mandatory minimum speed limit that all vehicles must maintain to prevent traffic congestion.
  2. It provides an advisory maximum speed warning of a hazard ahead, unlike a number enclosed in a red ring which is legally mandatory.Answer
  3. C
    It is a legally enforceable mandatory limit requiring strict compliance, while a speed in a red circle serves purely as guidance.
  4. D
    It applies exclusively to heavy goods vehicles and passenger buses, allowing cars to proceed at the national speed limit if their lane is clear.

Answer

The displayed signal is an advisory maximum speed intended to warn drivers of an upcoming hazard, whereas a speed within a solid red ring is a legally enforceable mandatory limit.
Flashing amber lights on motorway gantries and electronic message signs are warning indicators. They advise drivers of upcoming hazards such as fog, collisions, or slow-moving queues and recommend a sensible maximum speed. In contrast, speeds enclosed within a solid red circle are variable mandatory speed limits that are legally enforceable under UK road traffic law.

Step-by-Step Solution

1
Identify the visual characteristics of the gantry signal.
The signal shows flashing amber lights with a numeric speed value rather than a solid red circle.
Recognising the sign type determines whether the instruction is advisory or regulatory under the Highway Code.
2
Determine the legal status of flashing amber motorway signals under UK law.
Flashing amber signals indicate temporary hazards, lane closures ahead, or adverse conditions, making the displayed speed an advisory maximum.
Highway Code Rule 257 specifies that flashing amber lights warn of hazards and advise an appropriate speed, whereas Rule 261 establishes that red circular rings denote mandatory limits.
3
Distinguish between advisory guidance and mandatory variable speed limits.
Select the option that correctly identifies the advisory nature of flashing amber lights and contrasts it with mandatory red rings.
Exceeding a mandatory limit is an absolute offence, whereas failing to heed advisory speeds increases collision risk in hazardous conditions.

Key Concept

Distinction between advisory gantry signals (flashing amber lights) and mandatory variable speed limits (red circular rings) on managed motorways.
Estimated Time:1m 0s
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Topics

Smart Motorways and Active Traffic Management

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