I live and work in the UK, a country known for relentless roadworks.
Last week I drove through roadworks on the M1 that lasted for 18 miles, necessitating road users driving at 50 mph. Of course, almost all of this impressive stretch was simply coned off, with active work only present on one or two small sites. Signs indicate that work will continue into next year.
What justification is there for keeping such a large section of road cordoned off for improvements? Is it a safety or economical consideration? It would seem prudent to close off mile sections at a time to increase traffic flow and reduce the number of cones/signs/average speed cameras in use, but perhaps there is an underlying reason I am missing?