Memorandum from the Highways Agency (59A)
Thank you for your letter of 18 February. I
offer the following clarification on the points raised.
Schemes are subject to the New Approach to Appraisal
(or NATA) throughout their development, whenever a significant
decision stage is reached.
They are subject to assessment prior to entering
our Targeted Programme of Improvements. For example, our original
Targeted Programme of Improvements (TPI) of 37 schemes emerged
from the application of NATA to 67 candidate schemes during 1998.
Schemes that have entered the TPI since have all been subjected
to NATA, and schemes currently being considered within multi-modal
and road-based studies are all equally subject to the same appraisal
The current appraisal process we follow is as
set out in "Guidance on the Methodology for Multi Modal Studies"
which can be viewed at www.dtlr.gov.uk/itwp/mms/index.htm.
Once in the TPI, scheme appraisals under NATA
should be updated at the key decision stages public consultation,
at preferred route announcement, order publication and at any
subsequent public inquiry.
5 PER CENT
You have asked for details of the effect a 5
per cent reduction in congestion would have on travel times on
our network. The modelling for the 10 Year Plan is the responsibility
of the central departmentand it would be more appropriate
for them to answer these detailed questions. We have passed your
questions to them and have asked them to reply directly to you.
I can confirm the HA were asked to provide the
indicative pricing for the mixture of illustrative schemes in
the published 10 year plan.
The illustrative scenarios of constant motoring
costs and trunk road charging were assessed by DTLR using the
same programme of illustrative schemes from us.
Details of the underlying assumptions made in
DTLR's (then DETR's) modelling were published with the 10 Year
Plan in a document entitled "Transport 2010-The Background
Analysis". This can be viewed at www.detr.gov.uk/trans2010/index.htm.
The table below lists the 25 bypass schemes
identified and placed in the Targeted Programme of Improvements
(TPI) by the end of 2001. The original (July 1998) list of 19
included a scheme on the A23 in Coulsden, which has since passed
to the Greater London Authority. The scheme on the A11 at Attleborough
was originally classified as a congestion-relieving scheme, but
is now counted as a bypass (which means we still have 19 bypass-schemes
from July 1998).
|Road and scheme name
||Date scheme entered TPI
|1 A27 Polegate Bypass||July 1998
|2 A43 Silverstone Bypass||July 1998
|3 A6 Great Glen Bypass||July 1998
|4 A11 R'ham H'th-Attleborough Imp (now Attleborough Bypass)
|5 A66 Stainburn and Great Clifton Bypass
|6 A6 Clapham Bypass||July 1998
|7 A500 Basford, Hough, Shavington Bypass
|8 A650 Bingley Relief Road||July 1998
|9 A120 Stanstead-Braintree Improvement
|10 A41 Aston Clifton Bypass
|11 A63 Selby Bypass||July 1998
|12 A5 Nesscliffe Bypass||July 1998
|13 A6 Rothwell-Desborough Bypass
|14 A6 Rushden and Higham Ferrers Bypass
|15 A6 Alvaston||July 1998
|16 A10 Wadesmill-Colliers End
|17 A21 Lamberhurst Bypass||July 1998
|18 A421 Great Barford Bypass
|19 A5 Weeford-Fazely Improvement
|20 A47 Thorney Bypass||March 2000
|21 A38 Dobwalls Bypass||March 2001
|22 A3 Hindhead Improvement||March 2001
|23 A595 Parton-Lillyhall||March 2001
|24 A14 Haughley New Street-Stowmarket Improvement
|25 A483 Pant-Llanymynech Bypass