An audit of roads at possible risk from industrial accidents has been ordered after the scrapyard fire that caused major M1 disruption last week.
The blaze under an elevated section in north London saw lanes closed between junctions 1 and 4.
The Highways Agency will now provide details of all sites where potentially disruptive activities below or near roads take place.
The Department for Transport will compile a report in the next six weeks.
Transport Secretary Philip Hammond said: “It is crucial that we learn the lessons from this hugely disruptive event and ensure that we minimise the risk of something similar happening again.
“As well as identifying sources and categories of risk, the report will detail the options currently available for managing those risks, identify any gaps and make recommendations about how these should be filled.”
Mr Hammond added that Highways Agency staff had “worked tirelessly around the clock to reopen the motorway”.
Steel pillars have been put up beneath a bridge which was badly damaged when the scrapyard fire caused concrete to explode.
Engineers said it was a “miracle” the bridge had not collapsed because of the extent of the fire damage.
The Highways Agency said construction work on the bridge support was ongoing along with an assessment of other possible remedial works and warned drivers that delays could continue.