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Question

Difficulty: EasySmart Motorways and Active Traffic Management

You are travelling along a smart motorway and see the number 50 displayed inside a red circle on an overhead gantry sign above your lane. What does this signal indicate?

  1. A
    It is an advisory recommended speed due to temporary congestion ahead
  2. It is a mandatory speed limit that you must not exceedAnswer
  3. C
    It is a minimum speed limit and you must maintain at least this speed
  4. D
    It applies only to heavy goods vehicles and vehicles towing trailers

Answer

It is a mandatory speed limit that you must not exceed.
On smart motorways, speed limits displayed within a red circle on overhead gantries or roadside signs are mandatory. You are legally required not to exceed this maximum speed limit until you pass a sign displaying a different limit or the national speed limit symbol.

Step-by-Step Solution

1
Identify the shape and border of the overhead traffic signal
The display shows a circular shape with a red border containing a numerical value.
In the UK Highway Code and traffic sign regulations, signs in red circles give orders that are mandatory.
2
Apply the rule for smart motorway variable speed limits
The speed limit of 50 mph is legally enforceable for all drivers in that lane until changed or ended.
Mandatory variable speed limits are used on smart motorways to smooth traffic flow and manage hazards.

Key Concept

Mandatory Variable Speed Limits on Smart Motorways
Estimated Time:45s
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Topics

Smart Motorways and Active Traffic Management

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