Intersection traffic accident analysis

​Almost every day of the week, police officers are called to the scene
of a traffic accident to provide assistance. More often than not,
these officers report to a street intersection rather than an address
along a residential street. But how many times does a police officer
report to the same intersection? Moreover, are there trends occurring
for high traffic volume intersections? These were the sorts of
questions the Traffic Safety Committee of the City of Park Ridge aimed
to study. In addition, the committee wanted to analyze how many
accidents per month were happening at each intersection. Furthermore,
they needed and easy method for displaying these results to the whole
committee.

With these ideas in mind, the Traffic Safety Committee requested the
services of the Geographic Information System (GIS) Department. By
using the tools located within the GIS, each intersection accident that
was recorded by the Police Department could easily geocoded to a
geographical location. Geocoding is an operation that searches a street
or address data file and locates the coordinate where an address falls
on a particular street, in this case, the tool located the intersection
where the accident occurred.

Once the intersections are located, they are placed on a map in order
to analyze where the most accidents occur. The GIS Department
recommended representing each the number of accidents at each
intersection as a graduated symbol. This made it easier to discern
which intersections had the more accidents than other intersections (for
example, large circles for a high accident count and small circles for a
low accident count). By using this methodology, the final map product
was much easier to read and allowed the Traffic Safety Committee to
easily target which intersections required the more attention for
traffic safety studies.

Since the inception of this project, the analysis has been performed
every three months and all maps are immediately submitted to the Traffic
Safety Committee. Overall, it is easy to see how by taking data from a
simple recording project and using Geographic Information System tools
to analyze the data, the city was able to continue providing their
residents with the service of traffic safety.

Intersection traffic accident analysis

​Almost every day of the week, police officers are called to the scene
of a traffic accident to provide assistance. More often than not,
these officers report to a street intersection rather than an address
along a residential street. But how many times does a police officer
report to the same intersection? Moreover, are there trends occurring
for high traffic volume intersections? These were the sorts of
questions the Traffic Safety Committee of the City of Park Ridge aimed
to study. In addition, the committee wanted to analyze how many
accidents per month were happening at each intersection. Furthermore,
they needed and easy method for displaying these results to the whole
committee.

With these ideas in mind, the Traffic Safety Committee requested the
services of the Geographic Information System (GIS) Department. By
using the tools located within the GIS, each intersection accident that
was recorded by the Police Department could easily geocoded to a
geographical location. Geocoding is an operation that searches a street
or address data file and locates the coordinate where an address falls
on a particular street, in this case, the tool located the intersection
where the accident occurred.

Once the intersections are located, they are placed on a map in order
to analyze where the most accidents occur. The GIS Department
recommended representing each the number of accidents at each
intersection as a graduated symbol. This made it easier to discern
which intersections had the more accidents than other intersections (for
example, large circles for a high accident count and small circles for a
low accident count). By using this methodology, the final map product
was much easier to read and allowed the Traffic Safety Committee to
easily target which intersections required the more attention for
traffic safety studies.

Since the inception of this project, the analysis has been performed
every three months and all maps are immediately submitted to the Traffic
Safety Committee. Overall, it is easy to see how by taking data from a
simple recording project and using Geographic Information System tools
to analyze the data, the city was able to continue providing their
residents with the service of traffic safety.