Agenda item

Report of KCC Head of Transportation - Results of VISUM Transport Modelling


The Chairman agreed to receive an urgent update to the Report of KCC Head of Transportation – Results of VISUM Transport Modelling.


Brendon Wright, Strategic Transport and Development Planner introduced the report which summarised the results of the additional DS4 modelling scenario. The VISUM modelling work, undertaken by AMEY had tested a series of scenarios relating to the transport interventions that could be implemented alongside future housing and employment development.  Each of these scenarios had been predicated on an individual set of assumptions regarding the package of transport interventions.


The Board received a presentation from Steve Whittikar, Principal Transport Planner (AMEY), which set out the forecast scenarios for the DS4a and DS4b which was the option created by the Board at its July meeting with and without a Leeds Langley Relief Road (LLRR).


During the course of the discussion the following points were made:


·  The modelling results for DS4 (Do Something option 4) were presented as a comparison to DM option (Do Minimum transport modelling whereby only the Bridge Gyratory Scheme is implemented).


·  The modelling did not reflect individual journey times; it looked at the network as a whole rather than sections of the network.


·  It was confirmed that the VISUM modelling could be used as a tool for localised modelling but at present it was focused on the urban area at the busiest periods for travel in the am and pm.


·  The LLRR was estimated to offer approximately 25% improvement to travel time.


·  The impact of increased parking costs and bus frequencies was estimated to offer approximately 40% improvement to travel time.


·  It was questioned whether the estimated impact of increased parking costs and bus frequencies was achievable; was there a commercial appetite from bus companies to deliver this?


·  The impact on the A229 and A274 was considered but the Board also questioned whether detailed examination had taken place for other traffic ‘pinch points’ in the borough.


·  The Board considered the phasing of new development over the emerging Local Plan period which ended 2031, and the way in which traffic mitigation would need to be delivered in line with this.


·  The Board considered the application of constraint when considering a planning application for new development where impact on traffic and transport was deemed to be severe.  MBC consulted with the highways authority on planning applications but until now KCC had been unable to object on the grounds of severity as it was unable to provide evidence that demonstrated this. In terms of planning guidance what constituted ‘severity’ was open to interpretation and had yet to be challenged.  It was felt that the VISUM modelling undertaken could provide the evidence base required by the highways authority.


The Board agreed that a further, more detailed report was required on the proposed transport mitigation scenarios presented.





1.  That the Board’s support be given to KCC and MBC officers to work jointly to provide a report with further detail on the results of VISUM modelling on DS4. This should give consideration to the following:


·  Transport mitigation measures to support development.  This   should include consultation with bus and rail operator   alongside methods to increase multi occupancy car use; and


·  The phasing of new development.


2.  That the Board reconvene in approximately 4 weeks’ time to consider the report.


NOTE: Councillor Carter joined the meeting at 5.25pm, Councillor Ash left the meeting at 5.46pm, Councillor J.A Wilson left the meeting at 6.12pm, Councillor Carter left the meeting at 6.49pm and Councillor Whittle left the meeting at 6.53pm.



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