Jurnal Kejuruteraan 29(1) 2017: 23-34 Calibrating and Modelling of Statistical Delay for Signalized Intersections at Al-Nasiriyah City in Iraq (Permodelan dan Kalibrasi Kelewatan Statistik untuk Persimpangan Berlampu Isyarat di Bandar Al-Nasiriyah Iraq) Abdullah Hayal Khalaf Alshnawa*, Amiruddin Ismail, Alla Jaber Essa & Ameer Abdul Adheem Hussein ABSTRACT In this paper develops an empirical delay model for delay prediction by taking lane group parameters to make delay model in the feld where delay have considered very important measure that effects at signalized intersection because of relation of delay with performance of signalized intersection, lost travel time, fuel consumption, feasible of movement, discomfortable of drivers also, it is considered the primary measure to determine the level of service at signalized intersection. The main aim of this study is to make a feld delay model at signalized intersection by using microsimulation software to calibrate data and using statistical software (SPSS) to create model. The methodology of the study is made by using video recording and manual collected data by taken three biggest signalized intersections where the collection data was very challenged specifcally speed forward and uncontrollable drivers and others factors. Sidra Intersection 6.0 is described as an advanced micro-analytical model with a lane-by-lane method and a vehicle drive-cycle model that is used to estimate capacity and performance measures through an iterative method. Calibration of the software is very necessary to fnd accurate model that can be described the feld delay. Multiple Linear Regression analysis (MuLRa) has been generally statistical method to create a model. It has been taken into consideration in the modelling of delay at signalized intersection and adjusted R² is 80% with multi factors that effect on feld delay. Vehicle speed has been improved very signifcance level and impact factor on delay at signalized intersection by lane group experimental method and this fnding very important for all simulation software should be taken that in the accounts. Keywords: Statistical delay model; Signalized intersection; Calibration; Multiple linear regression analysis; Lane group; Speed vehicles INTRODUCTION Signalized intersections are an essential part of an urban road transportation system, regulate the fow of vehicles in urban areas. Traffic movements through signalized intersections are regulated by the signal system causing vehicular delays due to stops during the red time. Vehicular delay at signalized intersections increases the total travel time in an urban road network resulting in the reduction of speed and cost-effectiveness of the entire. Transportation system is increased travel time results in the degradation of the environment through increased vehicular emission in air and sound pollution. Thus, signal timing plan optimization is inevitable from many perspectives with less consumption of fuel and less environmental pollution being the topmost (Ratrout & Reza 2014). Increasing rate of growth population and overusing car ownership is one of the main reasons that leading to traffc congestion. So, processing and identifying problems and fnding the appropriate outputs for the congestions in these days in the rush hours due to the increasing number of people looking for a consequential increase in the number of transport (vehicles) of various types required the use of modern systems and software to control the congestion and to ensure the process appropriately, especially in areas or big cities, such as Al-Nasiriyah with a population density 525,000 and the designing of the city is non broaden. The lack of public transport cause using of private vehicles and increasing number of vehicles and narrow of roads, lack of modern technologies such as, smart camera, actuated signalization etc. that can be decreasing traffc congestion. Traffic congestion exists wherever demand exceeds the capacity of the transportation systems (that is the maximum traffc fow that can be accommodated) (Banks 2002). The development strategy of the cities is important for the analysis of highway and urban street systems to reduce the congestion on roadways, furthermore design of transportation facilities. Sidra 6.0 has been currently become commonly software for analysis and evaluation of intersections and roundabouts on the arterials roads (Akcelik 2009). Numerous researches have seek about problems of traffc congestion and attempting to fnd out a result that solve these problems. Traffc congestion consider the main problem for the traffc engineering. Increasing in the number of vehicles caused traffc congestion in the Al-Nasiriyah city (Hachamee 2011) and traditional methods for assessment of transportation are inadequate to grasp the modern technologies of intelligent transportation systems, especially applications of information technology recently developed. Identifying the problems of JK 29(1) 2017(4).indd 23 24/01/2018 3:39:22 PM