Staples Corner A view of the roundabout at the junction of the A406 and A5 taken from one of the pedestrian walkways. The road deck at the top of the photo carries the A406 through traffic. One of the pedestrian walkways is visible above the bus and behind it is the viaduct carrying the St.Pancras to Leicester mainline as it passes over (and under) the A406. The 142 bus route from Brent Cross to Watford Junction used to be a London Country service. Currently it is operated by Arriva the Shires. The vehicle today is 6004, a DAF SB250 with Alexander ALX400 body.