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In New Zealand, evaluation of TDM strategies falls under the Transfund Funding Framework and Evaluation Procedures. A major requirement in the assessment is that TDM projections must be conducted using methods comparable to those used to assess traditional transportation infrastructure projects. The economic evaluation approach must be based on changes “in the perceived cost/benefits, with addition of resource cost correction and externality effects[5].”

In addition, TDM projects are expected to produce benefits similar to those of road infrastructure projects and should be estimated using the same benefit and cost unit values, as provided by the Project Evaluation Manual (PEM). TDM projects should also be assessed with methods consistent with those developed for public transport and freight projects that contribute to reduced infrastructure and maintenance costs. The procedure takes into account the benefits added to existing users, the net benefits accruing to those switching modes as a result of the projects, and indirect benefits to the remaining users and environmental benefits.

Under these guidelines, New Zealand Transfund commissioned a 2004 study to develop

project assessment procedures comprehensive approach based three major benefit categories: 3

suitable to TDM on a cost/benefit

projects[6]. analysis that

The study provides a includes the following

  • Benefit to traveler switching mode(s);

  • Resource cost corrections; and,

  • Externality benefits.

The premise to the approach is that the mode share of “a function of the difference in generalized cost relationship is then used to determine the change in

one mode with respect to another is between the two modes.” This generalized cost to bring about the

observed change in mode COMMUTER Model v2.0,

share. as it

Conceptually, relies on travel

the approach follows that of EPA demand forecast models to obtain

evaluation parameters. Contrary to the EPA model, which uses a relative change, this approach uses an absolute percentage point change as reference The use of this approach “does not require any prior knowledge of initial within a company, school or community.”

mode share parameters. mode share

This measure of benefit comprises the following categories of benefits:

  • Travel time for new users;

  • Decongestion;

  • Induced traffic;

  • Vehicle operating costs; and,

3 Ultimately, the estimated benefit value for TDM users is $1.00 for each four percentage point change in mode share from SOV to public transport or cycle and walk.


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