LTT 634

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LTT634 front page_LTT634_p01 01/11/2013 07:48 Page 1

LTT634 01 November - 14 November 2013

Variable speed limits for trunk roads? POLICY | PLANNING | FINANCE | DEVELOPMENT

TRAFFIC MANAGEMENT

THE HIGHWAYS Agency is exploring whether features of managed motorways could be implemented on some of England’s busiest A roads. The use of mandatory variable speed limits and the greater use of electronic signs and traffic

detection equipment will be among the features considered in feasibility studies on two dual carriageway trunk roads in the Midlands: the A500/A50 in the Stoke-on-Trent area and the A38 from the A5 Weeford junction, through Burton-on-Trent, to Toyota Island, the junction with the A50, just south of Derby.

An HA spokesman told LTT previous work had concluded that managed motorway features would offer little in the way of capacity gains on trunk roads but that there could be a case for implementing measures on the grounds of safety and resilience. The studies will be undertaken

by a joint venture of consultants Parsons Brinckerhoff and Pell Frischmann. Each of the contracts is worth just under £20,000 and the work is due to be completed next March. Managed motorways have just been renamed smart motorways on the instruction of transport secretary Patrick McLoughlin.

Revised values for time savings herald wider appraisal shake-up

APPRAISAL

by Andrew Forster

MAJOR CHANGES to how transport projects in England are appraised were announced this week by the DfT, along with promises of further significant reforms in the near future. The most eye-catching of the changes introduced is a reduction in the value of business travel time savings. This follows persistent criticism of the DfT’s business case for high-speed rail, which assumed that business travellers don’t work on trains and that speeding up their journey would therefore convert unproductive time to productive time. Values for car travellers have been cut by 20% and for rail passengers by 33%. The Department is promising a new analytical strategy that will outline a major research programme to inform further changes to appraisal. A transport modelling and appraisal panel is also to be set up early next year, bringing together the country’s top appraisal experts. The Department will convene a seminar of practitioners before the end of this year to kick-off the new work. Accompanying this week’s announcements, the DfT has issued a restructured version of its WebTAG transport appraisal guidance in an effort to make it more user-friendly for practitioners. The DfT says the guidance “improves the clarity” of how wider economic impacts and regeneration impacts of transport schemes should be appraised. A major area of research inter-

The DfT wants to better understand how transport investment, such as HS2, affects economic growth and patterns of land-use

est for the Department is the impact transport investment has on economic growth. A “comprehensive survey” of the latest theoretical and empirical evidence into the growth impacts of “nationally significant” transport infrastructure and programmes of expenditure is proposed. Evaluations will also be conducted of the economic impacts of recently delivered or soon to be delivered transport schemes. “A key issue to address will be evidence of the extent of causality between changes in transport connectivity and measures of economic impacts such as productivity and employment density,” says the DfT. It promises new guidance on estimating the impacts of transport on the location of economic activity. It also wants to use land-use transport interaction (LUTI) models to better understand the spatial impacts of transport investment. “We will examine how estimation of land-use

changes can be considered in a way that is consistent with the transport models used in transport appraisals.” The revamped WebTAG guidance also recommends practitioners apply sensitivity tests +/-25% to values of time in their project appraisals. Further time savings research is promised. This DfT will consider the merits of changing the way business values of travel time are estimated. It plans to collect fresh revealed and stated preference evidence for both business and non-work travellers’ willingness to pay for journey time improvements. The Department also proposes introducing differentiated values of time savings for different types of transport project. “There is compelling empirical evidence that willingness to pay for travel time savings varies with journey distance,” says the DfT. HS2 Ltd has just applied higher values as a sensitivity test in the latest economic case for the high-speed rail

investment (see page 4). The Department promises new guidance on a risk-based approach to managing uncertainty in project appraisal. It will also revisit assumptions about market saturation, such as the demand cap applied to rail schemes, and how scheme benefits are extrapolated over the appraisal period. A feasibility study will be commissioned into developing a Spatial Computable General Equilibrium approach to estimating the economic impacts of transport. The DfT says that, in theory, this offers the “most comprehensive framework for modelling these impacts” but that it is complex and has huge data requirements. The Institute for Transport Studies at the University of Leeds has played a lead role in the research underpinning this week’s announcements. Professor Mark Wardman said: “I am very pleased that the Department has accepted many of our conclusions and recommendations including the commissioning of new studies to reassess the values used in transport appraisal and reduce the margin of uncertainty.” >> READ MORE?

HS2 appraisal

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Understanding and valuing the impacts of transport investment – latest DfT technical research and next steps in transport appraisal is available at http://tinyurl.com/kd3jct4

TransportXtra.com/ltt

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READER DRAW

LTT has three copies of columnist Paul Salveson’s new book, Railpolitik, to give away. Email books@landor.co.uk with ‘Railpolitik’ in the subject line by 22 November for a chance to win a copy.


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