Hong Kong's Transport Department said on October 26 that temporary road closures would be implemented in phases in Shek Mun, the northbound tube of Lung Shan Tunnel and the southbound carriageway of Fanling Bypass from 2am on Sunday, November 1, to facilitate the Northern Metropolis Marathon 2026. The marathon, half-marathon and 10km race were to start at Shek Mun, Hong Kong Science Park and Fanling Bypass respectively, all finishing at Fanling Bypass.

Subject to the events' progress, On Lai Street and its vicinity in Shek Mun were expected to reopen at 8am, the northbound tunnel by around 11am and the southbound bypass by around 3pm. Seven franchised bus routes (Citybus B7, B8, 79 and 79X; KMB B9, B9A and 78S) and two green minibus routes (67A and 811A) were to be diverted, truncated or suspended until roads reopened. First departures were to be brought forward on the MTR East Rail Line between Hung Hom and Sheung Shui, and the Tuen Ma Line between Tai Wai and Wu Kai Sha.

With the northbound tunnel closed, traffic from Fanling Highway to the Heung Yuen Wai Boundary Control Point and Sha Tau Kok was to be diverted via Sha Tau Kok Road, and the nearby Fanling Highway Bus-Bus Interchange was to close temporarily. Southbound tunnel and northbound bypass traffic were to operate normally. Motorists heading from the North District town centre to Kowloon were to be diverted via Jockey Club Road. The department advised passengers to plan early and use rail services.