Urban Transportation and Logistics

128 Nobuhiro Uno, Yasunobu Oshima, and Russell G. Thompson

numerator is the number of accidents and the denominator is the

measure of the population exposure—for example, volume or length of

road segment.

There is usually a wide variety of data sources relating to crashes,

including:

• Police department accident reports

• Coroner’s inquest reports

• Road authority reports

• Insurance company records

• Tow-truck operators records

• Research studies

In many countries, police departments are responsible for investigat-

ing crashes. Although reporting criteria and recording procedures differ

between jurisdictions, details of the location, persons involved, time,

RUM, and severity are usually recorded.

Data gained from the accident report form of ...