Appendix 2: Cost-benefit analysis and accessibility and environment

The benefits

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The two kinds of benefits which need to be taken into account can be considered under the headings of accessibility and environment. The meaning attached to those terms is broadly that used in Chapters I and II. The method described here enables them first to be considered separately, each in its own right, and then combined into a single 'portmanteau' index of Environmental Accessibility.

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In the absence of detailed and agreed standards, some very generalised method for measuring the benefits is required-one which is reasonably simple and yet which takes account of the essential features of accessibility and environment. The method described is only one of a number of possible approaches, but it has the merit of providing a rough test which can be applied consistently to the different schemes. Doubtless many improvements would be needed before it could be accepted as a precise measure of the conditions in existing or proposed urban areas.