Impact of CS4 on bus journey times, cycling journey times and traffic capacity

Closed 19 Nov 2017

Opened 28 Sep 2017

Results Updated 12 Dec 2018

We have undertaken detailed traffic modelling on our revised proposals for the route between Tower Bridge and Greenwich. See Section 1.2 of the report for a summary of the design changes made following the responses received to the consultation.


Traffic modelling allows us to predict what impact the proposed changes could have on road users, bus passengers, cyclists and pedestrians for the busiest times of the day, with results presented for the morning and evening peak hours.

Despite the sophistication of our traffic models, all traffic modelling is only ever indicative; it is intended to give an idea of where the impacts of changes in journey choice are most likely to occur. It assumes that drivers have perfect knowledge of the network and will always choose the quickest route available.

Our models aim to represent the busiest times of day predicting journey times during peak hours. These journey times may be mitigated by factors including motorists changing their journeys from peak times to other times; using different modes such as public transport, walking or cycling; and not carrying out journeys at all.

For completeness, the traffic modelling assumes a design for Lower Road that maintains Lower Road Gyratory in its current form with junctions amended to allow for a two way segregated cycle track on the eastern side of Lower Road. To improve local access, we have also assumed changes to the junction with Lower Road and Plough Way, permitting traffic between Rotherhithe New Road and Plough Way in both directions.

The traffic models also include committed improvements for a second entry into Rotherhithe Tunnel from Rotherhithe Roundabout to ease peak hour congestion within the local area.

A table showing likely journey time impacts on buses, cyclists and general traffic can be found via the link below.

Click here for journey times – CS4: Tower Bridge to Greenwich (PDF)

We would actively monitor and manage traffic conditions on the roads following the delivery of the scheme, and would aim to mitigate and manage traffic reassignment following implementation.

We are investing in advanced traffic signal technology to allow us to better manage traffic depending on differing conditions at any given time, and we are working to improve road user information so customers can make informed journey choices before they travel.

If you have any questions or clarifications with regards to our traffic modelling please email for more information.


  • Greenwich
  • Lewisham
  • Southwark


  • Anyone from any background


  • Cycling
  • Roads