Predicted impact of the CS9 proposals on journey times for general traffic, buses and cyclists, pedestrian wait times, and traffic reassignment

Closed 31 Oct 2017

Opened 21 Sep 2017

Overview

Changes to journey times

We have carried out detailed traffic modelling on the proposals for Cycle Superhighway 9 to understand how our proposals might affect journey times for general traffic, buses, cyclists and pedestrians.

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 journeys are most likely to be felt. It assumes that drivers have perfect knowledge of the network and will always choose the quickest route available.

Traffic modelling has been carried out to study the traffic impacts of the scheme at the busiest times of the day, and results are presented for both the morning and evening peak hours. TfL would actively monitor and manage the road network following implementation to ensure impacts were balanced.

To understand the impacts, we have assessed how London’s roads would operate in 2021, considering population growth, committed developments and other road improvements including the scheme at Hammersmith Gyratory as consulted on in 2016 (details of this scheme are available here). We then tested how London’s roads would operate in 2021 with the changes proposed as part of the scheme. This allows us to isolate the predicted impacts of CS9 from other changes which are not part of this consultation.

Tables showing predicted journey time impacts on traffic, buses, cyclists and pedestrians in the AM and PM peaks for key journeys can be found below:

 

Click here for a larger version of  the above table showing predicted journey time and pedestrian wait time impacts in the AM peak (PDF)

Click here for a larger version of  the above table showing predicted journey time and pedestrian wait time impacts in the PM peak (PDF)

If you have any questions or clarifications with regards our traffic modelling please email trafficmodelling@tfl.gov.uk for more information.

General traffic

The changes proposed are likely to mean that some journey times for general traffic would increase at certain times of day, particularly from Ealing Road and Kew Bridge in the morning and evening peaks, and from Chiswick Roundabout to Goldhawk Road in the evening peak. Journey times from Goldhawk Road to Chiswick Roundabout are also predicted to increase in the morning peak. However, some other journeys are predicted to be shorter at certain times of day, particularly from Goldhawk Road to Holland Road during the morning and evening peaks.

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 people can make informed journey choices before they travel.

Buses

The changes to the road layout proposed as part of CS9 are predicted to have an impact on the operation of the bus network and passenger journeys, particularly around Kew Bridge, Chiswick Roundabout, along Chiswick High Road and Beadon Road, where the CS9 proposals do not include the bus lane which was included in the consulted Hammersmith gyratory scheme.

The modelling predicts that journey times for bus routes would change, with the proposals resulting in a reduction in journey time on some routes, while other routes would see an increase. In particular, the routes which run east along Kew Bridge Road from Ealing Road to Kew Bridge would be affected, as would routes which run along Beadon Road on the approach to Hammersmith Gyratory. However, some other journeys by bus are predicted to be shorter at certain times of day, particularly from Hammersmith Bus Station to Holland Road in the morning peak.

Predicted journey time changes for selected key routes can be seen in the table. The changes on the main routes which are most significantly impacted, either positively or negatively, are described in more detail below.

Bus routes between Ealing Road and Goldhawk Road e.g. Route 237

An increase in journey time on route 237 during the morning peak in both directions would be likely. In the eastbound direction towards Hammersmith, modelling predicts an increase in journey time of 0-5 minutes. Most of this delay would be incurred on the section between Ealing Road and Kew Bridge. In the westbound direction towards Brentford, a journey time increase of 0-5 minutes is predicted, with most delay occurring on the approach to Chiswick Roundabout.

In the evening peak, route 237 is predicted to see an increase in journey time of 5-10 minutes in the eastbound direction, with most of the delay occurring on Chiswick High Road and on the approach to Kew Bridge along Kew Bridge Road. In the westbound direction, a reduction of 0-5 minutes in journey time is predicted.

Bus routes between Ealing Road and Kew Bridge e.g. Route 65

In the morning peak, an increase in journey time in the eastbound direction of 2-4 minutes is predicted. This delay would be incurred as the route approaches the Kew Bridge / Kew Bridge Road junction. No change in journey time is expected in the westbound direction.

Modelling predicts an increase in journey time in the eastbound direction towards Kew Bridge of 5-7 minutes during the evening peak. This delay would occur on the approach to Kew Bridge along Kew Bridge Road.

Bus routes between Kew Bridge and North End Road e.g. Route 391

An overall increase in journey time of 0-5 minutes on route 391 in the morning peak in the eastbound direction from Kew Bridge to North End Road is predicted. This delay occurs primarily on Beadon Road where the CS9 proposals do not include the bus lane which was included in the consulted Hammersmith gyratory scheme. This overall delay is predicted despite a reduction in journey times for buses travelling eastbound on Hammersmith Road. In the westbound direction towards Kew, we predict an increase in journey time of 0-5 minutes also. This delay occurs along Chiswick High Road and on the approach to Kew Bridge.

In the evening peak, the modelling predicts there would be an overall increase to journey times of 5-10 minutes in the eastbound direction towards Kensington. This delay is predicted to occur on the approach to Kew Bridge, along Chiswick High Road and on Beadon Road, again despite some journey time improvements along Hammersmith Road. In the westbound direction, during the evening peak, a delay of 0-5 minutes is likely. The majority of this delay is predicted to occur on Chiswick High Road.

Bus routes between Chiswick Business Park and Olympia e.g. Route 27

In the eastbound direction in the morning, route 27 would be likely to see an increase in journey time of 0-5 minutes from Chiswick Business Park to Olympia. Increases in journey time are expected on Beadon Road as with route 391, but improvements in journey time are expected from Hammersmith Bus Station to Olympia. In the westbound direction, no change in journey time is expected. 

In the evening peak, increases in journey time of between 5-10 minutes are predicted for route 27 in the eastbound direction. These delays occur mostly on Chiswick High Road and Beadon Road as with route 391. In the westbound direction, a journey time improvement of 0-5 minutes is predicted.

Bus routes between Hammersmith Bus Station to Holland Road e.g. Route 9

In the morning peak, route 9 towards Holland Road is predicted to see a decrease in journey time of 2-4 minutes on Hammersmith Road. Towards Hammersmith Bus Station, a reduction in journey time of up to 1 minute would be likely, occurring as route 9 heads west along Hammersmith Road.

In the evening peak, route 9 is predicted to see a decrease in journey time towards Holland Road, with a reduction of 0-1 minute. In the evening peak, a similar reduction in journey time is expected along Hammersmith Road.

Walking

The proposals include changes to pedestrian crossing facilities throughout the length of the scheme. Overall, five new signal-controlled pedestrian crossings are proposed and existing signal-controlled crossings are retained at or near to current locations. Pedestrian average wait times are not generally predicted to change and have been improved in some locations.

Due to significant changes in layout and junction design, pedestrian average wait times are predicted to be different at the Kew Bridge / Kew Bridge Road junction and the Chiswick High Road / Wellesley Road junction. Details of these changes are highlighted in the journey time summary table.

Cycling

CS9 would introduce a largely segregated cycle facility from Kensington Olympia to Brentford. As part of this proposal, access to the South Circular from Wellesley Road and Site Hall Gardens would be closed for all vehicles except cyclists.

As a result, journey times for cyclists for all sections of the route are predicted to improve in both directions, in the morning and evening peaks. Those cycling the entire route (from Ealing Road to Holland Road) are predicted to see improvements in journey times of 10-15 minutes in the AM peak.

Traffic reassignment

General note on modelling

TfL uses traffic assignment modelling to illustrate the predicted state of the road network in 2021. The model captures additional network demand and completed or planned projects across London in the coming years to understand how route choice and traffic volumes may change

It is important to note that our traffic reassignment modelling is only ever indicative; it is intended to give an idea of where the impacts of changes in journeys are most likely to be felt. It assumes that drivers have perfect knowledge of the network and will always choose the quickest route available. The reassignment is a picture of what the network may look like once the on-street proposals and associated driver behaviour has had a chance to bed in.

Kew Bridge Road to Chiswick Roundabout and Wellesley Road

The changes to the road layout at the junction of Kew Bridge and Kew Bridge Road, as well as the closure of Wellesley Road to general traffic, are predicted to lead to some traffic taking a different route. Some roads (e.g. Oxford Road North, Power Road) are predicted to see an increase in traffic because of our proposals, while other roads are predicted to see a reduction in traffic volumes. Traffic from the Chiswick area and further east is also predicted to take alternative routes such as the A4 (westbound).

Chiswick High Road to Goldhawk Road

Due to the road capacity reductions along Chiswick High Road, traffic is predicted to decrease in both directions on Chiswick High Road and to take alternative routes to avoid additional delay associated with the reduction in capacity.

Our modelling predicts that vehicles would take alternative routes, such as the A4, mainly within the local area, with some roads experiencing a decrease in flow, whilst others could experience an increase.

King Street

The proposals along King Street would not reduce capacity to the point that there is any significant predicted change in flow. In the morning peak, modelling predicts a small reduction in traffic between Standish Road and Studland Street, and in the evening peak there is a small increase between Goldhawk Road and Weltje Road predicted, with local roads in the vicinity not predicted to experience any difference in flow.

Hammersmith Broadway

There is a predicted increase in eastbound flow in the evening peak coming from the A4 and in both periods there is an increase southbound on Shepherds Bush Road.

Hammersmith Road to Holland Road

The proposals would reduce road capacity in the proximity of the A315 Hammersmith Road / Brook Green and Hammersmith Road / Russell Road junctions. This has led to a predicted reduction in traffic along A315 Hammersmith Road in both directions in the morning and evening peaks.

Again, our modelling predicts that vehicles would take alternative routes within the local area with some roads experiencing a decrease in flow, whilst others would experience an increase.

Click here to go to the overview page of CS9 in Hammersmith

Click here to go to the overview page of CS9 in Chiswick and Brentford town centre

Click here for the main CS9 landing page

Areas

  • Hammersmith & Fulham
  • Hounslow
  • Kensington & Chelsea

Audiences

  • Anyone from any background

Interests

  • Cycling
  • Roads