Drivers in Iraq tend to disregard lane markings and use every available meter of signalized intersections approach width. Thus, actual vehicles queues usually exceed marked lanes. This paper analyzes the effect of this behavior on signalized intersection capacity by estimating the passenger car equivalent (PCE) for different types of vehicles under these prevailing conditions. Multiple linear regression analysis was employed by considering all the through lanes in the approach as the unit of analysis; the necessary data were collected from a congested signalized intersection within Al-Hilla Province by using videotaping and for a period of four days (8 hours per day). The study resulted in some useful findings for signalized intersections capacity analysis. The saturation flow rate was estimated to be 1818 passenger cars per hour of green per marked lane. The results revealed that the minibus (e.g., 25-seat Toyota Coaster) and the passenger car time headways were equal, and thus have the same effect on intersection capacity. It is believed that this is due to the observed reckless driving of minibus drivers.