The A1(M) was closed in both directions near Letchworth yesterday (Tuesday, June 28).
An incident on a bridge over the carriageway near Junction 9 caused Hertfordshire Police to close the highway.
The closure affected the road between Junction 9 for Letchworth, and Junction 8 near Lister Hospital in Stevenage.
Motorists were advised to avoid the area and check before commencing their journeys.
A spokesperson for Hertfordshire Police said at the time: "We are currently dealing with an incident on a bridge over the A1m, near junction 9.
"The carriageway is currently closed in both directions between junctions 8 and 9.
"Motorists are advised to avoid the area and check before they travel.
"Thank you for your patience."
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