The motorway between Ripon (J50) and Catterick (J52) was closed in both directions due to the incident, reported at around 11.15pm on Wednesday, December 13.
National Highways says the road has now reopened.
Speaking shortly after 8am, a spokesperson for the agency said: "The A1M northbound is now fully open between J50 Ripon and J51 Northallerton and southbound between J52 Catterick and J51 following an earlier police led incident. Thanks for your patience, have a safe onward journey."
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