Roundabout Concept Plan


The Village of Oak Brook is currently looking into solutions for a
problem with traffic congestion in an area of town that gets very busy
during rush hour. As a result, Village engineers have been tasked to
develop various ideas to provide some relief to the high volume of
traffic in the area. A few ideas have included widening the road,
adding traffic lights, and creating a roundabout at the affected
intersection. Being that there is a bridge to the south of the
intersection, the idea to widen the road is not feasible. Additionally,
the Illinois Department of Transportation denied the idea of an
additional streetlight at the intersection. That left the idea of a
roundabout still on the table, which is somewhat unconventional in this
area, but still a very effective means of controlling traffic.

In order to get a better idea of how the roundabout would look and
work, the Village hired an outside consulting company to come in an
provide a plan for what the roundabout would look like, how big it would
be, and what it would cost. In order to facilitate their research, the
GIS specialist provided them with the necessary layers for their
analysis, some of which included; contour lines, property boundaries,
imagery, and all utility systems. Once their engineers were able to
draft a drawing in CAD it was provided to the Village in both paper and
digital formats.

Once the Village received the CAD drawings they wanted to know how it
would affect current property boundaries in case the Village would need
to acquire new land or an easement. As a result the GIS specialist was
tasked with converting the data to a compatible format and analyzing
the total area affected. By intersecting the roundabout proposal and
current property boundaries, they were able to determine the amount of
land affected and who owned it. This information was will now be taken
into consideration when ultimately determining whether or not this
roundabout will be constructed. Without GIS, this type of analysis
would not have been possible and the consulting company would have
charged considerably more to develop the data which provided the concept