Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : HCS

Studying Alternatives and Traffic Solutions to Change an Existing Three Legs Intersection to an Interchange

Ahmed Sabhi Abdul-Jabbar

Engineering and Technology Journal, 2013, Volume 31, Issue 2, Pages 46-70

Traffic congestion has become a phenomenon of the normal daily things to the Iraqis in recent years. In the present study, three legs ground intersection of, modern village in Alexandria / Babil province and a comprehensive study were made to identify the level of service at the intersection in the base year (2011), threealternatives have been proposed to ensure the work of the intersection in acceptable level of service in the target year (after 25 years from now). The highway
capacity software (HCS-2000) was used in the assessment and indicators of effectiveness for the intersection. Traffic analysis results showed that the intersection level of service works is of type (F) at both years of the foundation and goal (2011,2036). In the first alternative a Trumpet type interchange was suggested for the direction coming from Karbala to Baghdad, and the level of service for the intersection of this alternative ranges between (A) to (B) in the base year and ranging
from (B) and (C) in the target year. The second alternative includes the construction of two-way over-pass on the main road between Baghdad and Hilla; the results of this alternative are similar to the results of the first option alternative. The third proposal has included the establishment of one-way over-pass from Baghdad to Hilla; the
remaining movements in the intersection were controlled by a traffic signal. After analysis it was found that, the traffic level of service works the intersection of type (C) in the target year delay time of (23.4 sec), which is considered an acceptable level of serviceafter 25 years of theestablishment.

Evaluation The Performance of Al-Thawra At-Grade Intersection Using The HCS2000 Computer Package

Ali Majeed K.Al-Ubadiy; Zeena Tariq Al-Azzawi; Nawal Dawood S

Engineering and Technology Journal, 2010, Volume 28, Issue 15, Pages 5088-5101

Al-Thawra signalized intersection is one of the most important intersections in AL-Hilla city because it relates the Governorates: Baghdad, Najaf, Kerbala and Babel, and serves of about 21000000 passages of vehicles yearly. The excessive traffic volumes, during the peak periods (at morning and evening), of vehicles that entering the
intersection increase traffic density, reduce travel speed, increase travel time, and increase the delay values. The delay values are reflected by McTrans Center, University of Florida {Highway Capacity Manual (HCM2000)} to an indicator named LEVEL OF SERVICE (LOS). The operational analysis of the existing conditions of this intersection
by the Highway Capacity Software (HCS2000) indicates that the LOS of it equal to (F) with an intersection delay value of 263.7 sec./vehicle and a degree of saturation exceeds 1.5. Therefore, and because of the reasons above, it is important to improve the performance of Al-Thawra Intersection by separate the conflicting traffic movements
with an overpass bridge. The traffic survey shows that the high traffic volume of through movement of the North-South direction (Baghdad-60St.) has the major effect on the intersection. Therefore, the North-South is the suitable direction to construct the suggested bridge overpass to separate the through traffic of this direction (from Baghdad
to Najaf {60 St.} and vice versa) from the other movements of the intersection. The results indicate that the intersection LOS equal (C) with a cycle time of (58) sec. and an intersection delay of (22.8) (sec./veh.) at the object year 2027.