What are Smart Motorways and how they work

Smart Motorways image by Tatchaphol (via Shutterstock).
More of our motorways are becoming Smart Motorways, as seen above with this section of the M25 motorway. Image by Tatchaphol (via Shutterstock).

Whatever you say about smart motorways, they are a necessary evil in getting us from A to B. On a bog-standard motorway in United Kingdom, the speed limit is 70 mph for cars and 60 mph for PCVs and HGVs. If one section of motorway is designated as a Smart Motorway, the speed limit varies from the default 60 or 70 miles per hour. Speed limits are adjusted in accordance to traffic flows. This is a process known as Active Traffic Management.

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