HS2 will be constructing the Colne Valley Viaduct over Moorhall Road during the Summer Holiday period this July and August, which means that there will be Temporary Traffic Lights, Night Time Road Closures and a 3-Week Full Road Closure (24 hours a day) on Moorhall Road over the coming weeks.

 There will be a 3 Week Full Road Closure of Moorhall Road (either side of the HS2 Haul Road Crossing) between 28/07 and 18/08 while the Viaduct is built over Moorhall Road (shown in Red). There are also 4-Way Traffic Lights during the Day (in White), and Night Time Road Closures (in Orange) in the weeks either side of the Full Road Closure.

 Unfortunately during the works there is no access to any vehicles including Emergency Services Vehicles (who have been notified of the Road Closure and the need to use alternative routes).

TfL have confirmed that the 331 will not run to Denham during this time but will be replaced by a Shuttle Service operated by HS2/Align that will run from Uxbridge Station through to Denham Train Station.

Route 331 will run from Uxbridge Station but rather than follow the normal route through Denham and Moorhall Road, Route 331 will run via Swakeleys Roundabout, Swakeleys Road, Harvil Road and then continue on the normal Route through Harefield, Northwood & onto Ruislip.