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Recommendations for new and existing data While existing data is useful, we recommend that a travel diary approach would be useful in improving the picture of how car use and mixed mode use differ between members and non-members. Initially we suggest that car club members and joiners should be asked to fi ll in a travel diary (similar to the NTS) but with the added question of whether they would have made the trip before being a member, and if so whether they would have used a car. One problem is estimating the journey length but this could provide more precise estimates of changes in car mileage. We also recommend redrafting of the existing mileage question which seems to have caused some problems for respondents.


An easy to use BCR tool has been produced, which uses average data for car mileage and membership per car, and England and Wales data for average impacts. This enables the use of benchmarking to provide individual scheme costs and benefi ts. However, it is straightforward to alter the appraisal worksheet to incorporate locally derived values for some of the input parameters.

In addition it is possible to vary the membership numbers and car mileages in general terms between rural and urban schemes to refl ect differences. The source assumptions are also provided and these can be also be developed or altered as required and as more data becomes available.

We also recommend further data is collected for rural areas, for example expanding the sample size from existing clubs as well as collecting from new clubs.

For DfT we would recommend consideration of an addition to the TAG data book, setting out some fi gures equivalent to the marginal costs which cover health benefi ts either per car kilometre avoided or car ownership avoided. From this work we suggest that the latter is probably a better guide.

Recommendations on data would lead to a situation where the variation in benchmarks for different areas could be produced, and it is straightforward to amend the spreadsheets to take this into account.

Overall the DCCE schemes assessed show good value for money even in a very short timescale of 5 years, and over a more normal 30 year appraisal period have BCRs mostly in double fi gures. The package as a whole is also a very strong performer and this gives added confi dence that the method is robust, transparent, and proportional.

The appraisal worksheets for the 7 Tier 1 schemes and the user guide are included in the Technical Appendix to this report.

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