Abstract: Improvement and development of the highways and intersections are very important factors in the cities in order to focus the future programing. Level of Service (LOS) is a reality factor in evaluation the design speed, travel time, traffic volume, density and others traffic parameters to provide safe, efficient and convenient movement for road users and goods. Random access points and conflicts maneuvers found throw study section which know as Baghdad-Mosul highway intersected with Al-Jediel residential area, cause many types of traffic accidents resulting in Fatal (F), Personal Injury (PI) and Property Damage Only (PDO) due to fail to follow the engineering standards in the study area. Data have been collected according to field survey in order to measure traffic flow parameters using mechanical count methods within peak hour while the analysis was done by using (Excel and highway capacity system programs). It was concluded that, when designing acceleration and deceleration lanes, then re-analysis the data by using highway capacity system 2000 program, the Level of Service (LOS) will be increase from D-C in the study area section length due to improvement in operation speed and traffic characteristics. Then, as the probability of a traffic accidents type right angle and sideswipe collision will be decreases by 22%, due to reduce in merge and conflict points between traffic movements thus it well be increase safety and convenience factors resulting in improvement in traffic characteristics and improvement of pedestrians crossing through separation between the major and secondary highway. However, the improving the performance of overpasses crossing, resulting in decreasing traffic type (vehicle-pedestrian) by 55% in the study area.