Abstract
There are both obvious and subtle difficulties in the use of aerial photographic data to estimate the various space characteristics of traffic—for instance, the distribution of space headways or the spatial speed distributions. The obvious ways of estimating lead to serious errors. We develop a fundamental theorem which gives an identity between the space distributions of speeds and headways and their distributions under “synchronous” observations. This theorem is then applied to lay the groundwork and give methods for correctly estimating the desired space characteristics.
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