Treatment of missing data in road safety investigations; methodological innovations.

Perhaps the largest and most universal problem shared by road safety researchers is the problem of missing data. The terminology ''missing data'' is somewhat misleading. Rather, more appropriately, the data have been ''reported'' missing. Non-deviant behaviours will be underreported in agency records and deviant behaviours will be underreported in surveys of individuals. A method to overcome these problems is tested here briefly.