Other elements which should be obtained when analyzing accidents include--
Driver information such as age, sex, and driving experience.
Seat belt usage.
Command or unit.
d. Prepare Collision and Condition Diagrams
When analyzed traffic data indicates a particular location (such as a curve or an intersection) is
experiencing a large number of accidents, a collision diagram should be completed. This will permit
study and analysis of that location.
(1) A collision diagram consists of--
o An outline map of the location.
o Symbols showing the direction of movement of vehicles and pedestrians involved in
o Stationary objects important to the accident.
Figure 2-3 is an example of a collision diagram. Each collision diagram should include--
A drawing of intersection.
Identification of the diagram.
Identification of the streets.
A plot of the accident showing the following:
- Direction of travel.
- Date and time of accident.
- Road and weather conditions.
- Unusual conditions (flood, intoxication).
Check the diagram and locate each of the above elements. Take care to ensure the diagram does not
show different sets of circumstances. For example, showing an intersection before and after a stop
sign has been installed.