It is a bold statement to make that wide sight-lines improve traffic flow.
My evidence for this is from observing the traffic flow at peak times at the junction of Red Road, the Maultway, and Upper Chobham Road in Camberley. These roads meet at a substantial traffic island.
All of the roads leading onto the traffic island have suffered from queues. Some road more so than others. There is available data on traffic flows, collected to assist in planning for the new housing at Mindenhurst in Deepcut. I’m not referencing that data here. My statement is from personal observation.
The road works at the island are significant, creating a filter lane from Red Road, turning left into the Maultway, and from the Maultway turning left into Red Road.
From my observations, and I stand to be corrected here by more regular users of the roads I mention, even with the ongoing road works and the dislocation that that causes, the traffic flows have improved, and traffic queues are less than before.
My conclusion is that the improved visibility at the island, from almost from all directions, is the main cause for the improvement. A significant number of trees and scrub has been removed, such that drivers now have a wider area of vision of the traffic. See my photos of the situation as of early yesterday evening. Click on images to expand.