Rockingham hill on the edge of Corby is currently closed for road repairs.
The steep climb, which has a 12 per cent gradient, is shut with traffic being diverted through Cottingham.
The website roadworks.org says it is closed today between Uppingham Road and Gretton Road for category one defect repairs.
Northamptonshire County Council say work is scheduled to finish by 3pm today (Wednesday).
A spokesman said: “While the road is closed, workers are also carrying out repairs to signage and emptying gullies.”