The 'transport' bullet point in the DPD refers only to the Deards End Lane railway bridge. This would apply only to the proportion of traffic passing to and from Stevenage and beyond.
Traffic passing from KB2 to or from the South of Knebworth (e.g. Welwyn and the A1(M) junction), will tend to try to pass under either of the Gun Lane or the Bridge Rd (Woolmer Green) railway bridges, both narrow single track, with narrow pedestrian pathways. Wych Elm Lane, which borders the proposed KB2 site to the west, and leads into Bridge Rd., is a single track road with passing places, unlikely to be suitable for the expected increased traffic flow. Bridge Rd, from the railway bridge to the junction with the B197, is a narrow residential road with necessary on-street parking that is already difficult to transit through. Increased traffic from KB2 would present a considerable safety issue. The junction with the B197 would be a major problem, as this is a very busy road at commuter times, and turning right from Bridge Road will be very difficult.