An Improvement of Three Leg Signalized Intersections in Duhok City Kurdistan-Iraq
Nowadays, number of cars increases in Iraqi Kurdistan. Duhok is one of the Iraqi Kurdistan cities where an enormous increase in the number of cars and population is noticed during the last decade. Roads were been mended according to the 1970s plans where the city was small and number of cars was few. Although the city geographically is located in a hilly area and between two mountains, mending roads is a problem of area. Roads in the mentioned city are quite busy due to the high number of cars, traffic jams can be noticed in every corner of the city especially in signalized intersections. The level of service (LOS) in most of the signalized intersections is F or E. in order to lower the high (LOS), a three leg signalized intersection has been chosen to do an improvement on. During the study the number of the cars (Volume) have been enumerated in all lane groups and the results showed that the (LOS) was E in the intersection. As a result, some solutions have been provided according to the site area and the traffic flow. Solutions were geometric changes, cycle time changes or combination in both geometric and cycle time changes. According to the collected data, it was found that level of service was E for WB and SB and for EB was D. Based on data analysis it was found that LOS has not been improved when only one of the mentioned solutions is applied. In order to have the best improvement, the combination between geometric and cycle time length changes are applied. Analysis showed that there was a remarkable improvement in LOS and changed from E to D.
2. Schadschneider, T.Poschel, R. Kuhme, M. Schreckenberg, D.E. Wolf. “Traffic and Granular Flow”, Springer-Verlag Berlin Heideberg, (2007).
3. Bent Thagesen, “Highway and Traffic Engineering in Developing Countries”, by E & FN Spon , London (1997).
4. Federal Highway Administration, US Department of Transportation. Retrieved from https://safety.fhwa.dot. gov/intersection/conventional/signalized/fhwasa13027/ch7.cfm
5. Highway Capacity Manual (HCM) (2000). Transportation
6. Research Board, National Research Council,Washington D.C., (2000).
7. M. Slinn, P. Matthewes, P.Guest, “Traffic Engineering Design, Principles and Practice”, 2nd Edition, Elsevier Ltd, (2005).
8. O’Flaherty, C.A., “Transportation Planning and Traffic Engineering”, (1997).
9. Roess, R.P. and Prassas, E.S. and Mcshane, W.R., “Traffic Engineering”,Pearson Prentice Hall, 3rd Edition,( 2004).
10. R.L. Brockenbrough, K.J. Boedecker,JR., “Highway Engineering Handbook”, 2nd Edition,McGraw Hill, (2004).
11. R. Robinson, B. Thagesen, “Road Engineering for Development”, 2nd Edition,Spon press,London (2004).
12. W.F. Chen, and J.Y. Richard Liew “The Civil Engineering Handbook”, 2nd Edition,CRC press LLC, (2003).
13. Xin Yu and Goro Sulijoadikusumo. Assessment of Signalized Intersection Capacity in Response to Downstream Queue Spillback. Retrieved from https://www.westernite. org/annualmeetings/12_Santa_Barbara/Compendium/2C-Yu-Sulijoadikusumo.pdf.
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License [CC BY-NC-ND 4.0] that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
AJNU is committed to protecting the privacy of the users of this journal website. The names, personal particulars and e-mail addresses entered in this website will be used only for the stated purposes of this journal and will not be made available to third parties without the user's permission or due process. Users consent to receive communication from the AJNU for the stated purposes of the journal. Queries with regard to privacy may be directed to firstname.lastname@example.org.