What would you do if you saw a 20mph variable speed limit on a motorway?

DRZ said:
If I saw a 20mph limit on a motorway I'd be slowing down as safely as possible, eyes peeled and tbh looking for the nearest exit as something horrendous is likely to happen (driver on the wrong side of the road, livestock on the carriageway, lorry full of babies shed its load etc etc). IIRC 40mph is the minimum regular speed limit on a motorway so anything less than that is likely to be as a result of a serious intervention.
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I was in a training course and the instructor said that if you see 20mph on a variable speed limit motorway, it means oncoming traffic in your carriageway - a vehicle going the wrong way. That might be many 10s of miles away due to needing to create a sterile area but might be over before you get to it. I never got taught about that prior to yesterday and wondered if anyone else knew.
 
DRZ said:
It is in the form of responses to FOI requests made to HE.
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Do you have any links?

Edit:

www.gov.uk

Variable signs and signal policy

Response to a request for information regarding details of the variable signs and signal policy.
www.gov.uk www.gov.uk

Oncoming vehicle
A vehicle travelling against the flow of traffic creates extreme danger, so it shall be treated as a confirmed incident no matter the information source. A blanket 20mph speed restriction and the ‘ONCOMING VEHICLE’ legends hall be set in both directions of the reported location. The rationale for this action is that the driver of the oncoming vehicle could have their attention drawn to the VSS set on the opposing carriageway.
 
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