Emergency services have been called to the M1 motorway following reports that a man has fallen from a motorway bridge.
Drivers are advised to seek an alternative route
A spokesman for Highways England said:
Exit the M1 southbound at J4 and join the A41 Watford Bypass. At the first roundabout take the first exit to continue on the A41 Edgeware Way. At Apex Corner roundabout, take the second exit to join the A1 Watford Way. At the Mill Hill Circus roundabout take the second exit to continue on the A1 Edgeware Bypass/Watford Way. At the Fiveways Corner interchange take the second exit to join the A41 Watford Way southbound directional towards Central London. Continue on the A41 southbound through Colindeep and Hendon Central interchanges. At the Brent Cross interchange, exit the A41 and take the third exit to join the A406 (W) North Circular anti-clockwise. Take the next exit on the A406 (W) to access Staples Corner interchange which is J1 on the M1.
The Met Police has been contacted for comment