A simulation model has been designed to model the traffic when the number of lanes has been reduced due to construction work (bottleneck) using the ARENA simulation program. The ARENA simulation model consists of about 1750 modules (statements) and it uses the entity – transporter pairs to represent either a car or a truck with specific features assigned in the model. The model is developed to simulate two lane road traffic in same direction reduced to one lane through the construction zone. The model was designed to run on a PC. A minimum processor speed of 2 GHz and at least 256 MB of RAM is desirable to run the model. The ARENA Research Version 7.01 must be used for the simulation. The simulation model was run for a 24 hours time period for a weekday. The data used as input variables for the ARENA simulation model were collected during summer 2004 at the I-76 Westbound construction zone near Rootstown, Ohio as a part of the project entitled “Improved Work Zone Design Guidelines and Enhanced Model of Travel Delays in Work Zones” for Ohio Department of Transportation. This data was analyzed in order to be used as input and validation for the simulation model. The ARENA model could not be fully evaluated since the actual traffic volumes which were observed and collected were not high enough to cause queues in the lane reduction area (lane reduction from two lanes to one lane). For the relatively low traffic volume investigated in the real world the ARENA model, as well as the QuickZone model did not indicate any queues and delays.