The county's police say emergency services have been dealing with a serious incident at a bridge over the A19 at South Kilvington near Thirsk.
A police spokesman said: "A passing motorist dialled 999 at 11.35pm on Tuesday (December 5) after seeing a person on the wrong side of the railings.
"Police quickly closed the road in both directions between the A170 Sutton Road Bridge and the A168 with assistance from National Highways.
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