Metropolitan cities around the world are facing major struggles with their transportation system. Living in one of these cities – namely Istanbul – I experience these problems on a daily basis. As a highway design engineer and traffic planner, I want to take a step forward in resolving these issues and create better and safer connection networks.
The challenge: Creating the best possible interchange
I am working for a company that has been assigned to design a new highway interchange in Buca, a district of Izmir. Traffic volume in this area is high and the project zone is surrounded by public facilities, such as a cemetery and a hospital. As the design engineer responsible for the project I decided to design an interchange that not only guarantees easy and comfortable access to the facilities, but also increases the capacity and gets rid of conflict areas.
“I designed an interchange in Izmir, Turkey, that guarantees easy access to the nearby hospital and cemetery, reduces conflicts and increases capacity.”
Which design is the best?
We created various design alternatives using the commercial engineering software Civil 3D. Doing this, we had to keep in mind the constraints and criteria we had been given concerning for example land-use and environmental issues. We also had to consider the AASHTO road design criteria. We then compared and evaluated the alternatives and opted for a two-level interchange with maximum capacity that would also guarantee easy access to the nearby public facilities.
Microsimulation as a helpful communications tool
For research purposes and to evaluate the performance and level of service of the interchange, Assistant Professor Yavuz Delice from Yalova University and I additionally created a PTV Vissim simulation. Not only did it help me to design the intersections. Thanks to Vissim’s powerful graphical demonstration, we were also able to more clearly present the output of our engineering work to our clients.