Traffic data, analysis and feedback.

Traffic analysis has been undertaken looking at traffic counts, ANPR compliance, bus journey times and through-traffic analysis. Data has been collected inside LTN areas as well as on the immediate boundary roads that surround them for 3 assessment stages . This is in line with the monitoring strategy .

  • Stage 1 analysis was published in February 2021
  • Data for Stage 2 analysis is published below
  • There are 15 traffic count sites for the LTN, one on each of the boundary roads and 12 within the LTN. Counts were conducted in December 2020 and in April 2021.
  • The change in traffic volumes is based on a pre-pandemic baseline that has been calculated to account for lower traffic levels that have been observed since the pandemic so that only the impact of the LTN is shown
  • Data Collection:

    Monitoring of the LTNs is being completed by independent transport consultancies as follows:

  • SYSTRA leading on the monitoring programme and coordinating the independent traffic analysis
  • MHTC leading on the Automatic Traffic Counts (ATC) data collection
  • The Floow leading on the telematic data collection and analysis
  • Project Centre validating the traffic survey data analysis completed by SYSTRA.
  • Data has also been collected from:

  • Lambeth Council Enforcement Team data on compliance with the traffic restrictions
  • Transport for London for bus journey times
  • Traffic counts:

    The total number of cars, cycles and all motor traffic recorded on internal and external roads (for pre- and post-implementation) are provided below:

  • The total volume of motor vehicles counted on internal streets has decreased by around -25%, and by -2% on external streets, for giving an overall decrease of -8% across the entire area.
  • Changes on boundary roads appear to be minimal, with the largest being a reduction of 1,300 vehicles on Clapham Road. Vehicle flows changed minimally on Harleyford Road and increased 3% (+548 daily) on South Lambeth Road.
  • Stage 2 through-traffic analysis:

    The below maps are created by analyzing GPS and telematics data, and provided by consultant “The Floow”. They were used to identify which roads had high proportions of through traffic. Through traffic means that these journeys were using residential roads as part of a longer journey and were not for accessing anywhere within the LTN.

    Below are the before and after through traffic analyses for the Oval to Stockwell LTN. Roads where traffic volumes are high and where the majority of that traffic is passing through are shown in red. The proportion of through traffic has been significantly reduced across the LTN area – and indicated by the shift from red to blue.



    Stage 2 bus journey times:

    Journey times have first been summarised by route, by taking the total journey time across stop-to-stop links along the corridor and dividing by the length of these links, to give minutes per kilometre.

    There has been negligible impact from the LTNs in most cases with the average bus journey times returning to approximately baseline levels or with a marginal improvement in journey times in some cases.

    Stage 2 ANPR Compliance:

    Very few people who live within the LTN have been issued a penalty charge notice. The graph below shows where people, who have driven through the modal filters, have registered their vehicle (which is typically their home address). The vast majority of people driving through the filters are non-local traffic, from outside Lambeth.

    Since the start of the ETO we have received 80 traffic related emails


  • A reduction in traffic speeds and volumes (including HGVs)
  • Reduces aggressive traffic
  • Reduces risk of collision
  • Creates a better quality of life, less anti-social behaviour and less speeding along Handforth Road
  • Transformed the local vicinity of Fentiman Road
  • Moderately improved effect on traffic using Heyford Avenue
  • Concerns:

  • An increase in vehicle traffic including HGVs
  • Roads of concern included Lansdowne Way, Stockwell terrace and roads east of Clapham Road (St Michaels Road, Robsart Street, Camberwell New Road, Groveway, Stockwell Park Crescent and Sydney Road)
  • Respondents also noted traffic volume increase exacerbated by road works
  • Lansdowne Way

    Stakeholders have raised issues that includes, increased volumes, speeding, inadequate carriageway width leading to vehicles driving on the pavement and blocked access to car park entrances.

    We are currently developing options for this location to address the issues raised by residents. These proposals will be shared with stakeholders in the coming months.

    Clapham Road/Harleyford Street banned left turn

    We are actively working with TfL to reinstate the banned left-turn from Clapham Road onto Harleyford Street in order to reduce traffic congestion. We will be providing updates via newsletter updates and our other communication channel as and when we have them.

    This engagement phase has finished

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