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Article
PREDICTED EFFECTIVENESS COUNTERMEASURE

Author: Sahar S. Naham
Journal: Iraqi journal of mechanical and material engineering المجلة العراقية للهندسة الميكانيكية وهندسة المواد ISSN: 20761819 Year: 2009 Volume: C Issue: first conf./ eng. coll. Pages: 363-372
Publisher: Babylon University جامعة بابل

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Abstract

Improving road traffic safety has high effect to reduce the cost of traffic accidentand save the user of highway. Since 1985 the average stopped delay has been used asthe measure of service in signalized intersections analyses , on the other hand it isdifficult to evaluate the traffic safety in terms of change in number of traffic accident,because the traffic accidents accord has no reliable accident recorded ,while it not onlyreflect the number of accidents well, but also their nature ; traffic conflict technique isan efficient tool for analyses traffic safety. This study is aimed to developed traffic safety at 4 four- leg signalized intersectionsin Baghdad City. Regression analyses is performed to relate hourly traffic conflict andaverage stopped delay .Specific categories of countermeasures such as signalizationand geometric countermeasures are adopted. HCS 2000 software are adopt to determinethe average stopped delay before and after countermeasure implemented. The results show that the negative exponential model related hourly traffic conflictto average stopped delay and show a better explanation rather than linear model ,aswell as it is found that exponential model explains increasing variation (81.6 ) of totalhourly traffic conflict in relation with average stopped delay . The highest reduction innumber of traffic conflict after signalization countermeasures is 74.63% more than thehighest reduction after geometric countermeasures when it reduce by 58.07% . Thisstudy recommends to use traffic conflict technique as a tool to improve traffic safety byany proposed countermeasures.

Keywords

Safety --- Traffic --- Conflict --- Delay --- Countermeasure


Article
A Sustainable Strategy to Upgrade Safety at Traffic System
استراتيجية مستدامة لرفع مستوى الامان في منظومة المرور

Author: Hussein A. Ewadh
Journal: journal of kerbala university مجلة جامعة كربلاء ISSN: 18130410 Year: 2017 Volume: 15 Issue: 1 Pages: 124-130
Publisher: Kerbala University جامعة كربلاء

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Abstract

Traffic safety studies based on crashes data are used to enhance safety by specifying appropriate countermeasures. Rather to wait for crash events, that involve losses in human and properties, this paper demonstrates a sustainable strategy to evaluate and upgrade safety at traffic system as well. The paper demonstrates analysis of traffic conflict "near-crash" data at specified sites in the traffic system. A case study of traffic conflict is performed at selected sites of three legs signalized intersections in Baghdad City. Regression analysis is used to develop model relating observed hourly traffic conflict and average stopped delay. Based on HCM output, a countermeasure is evaluated due to before and after study of average stopped delay and accordingly the involved conflicts based on the developed statistical model.A developed statistical model indicates that 92.5 % of variation in hourly traffic conflict can be described significantly by average stopped delay. In consequence, more than 35 % of potential conflicts can be reduced due to countermeasures and the highest reduction (62.6 %) is due to increase of lane width. This strategy maximizes the usefulness of conflict study as a sustainable aid to predict the effectiveness of any proposed countermeasure, thereby upgrades safety at any traffic system.

تستخدم دراسات السلامة المرورية المعتمدة على بيانات الاصطدامات في تحسين السلامة بمعالجات مرورية مناسبة. بدلا من انتظار حوادث الاصطدامات التي تكتنف خسائر في الارواح والممتلكات يقدم البحث استراتيجية مستدامة لتقييم ورفع مستوى السلامة لمنظومة المرور.يستعرض البحث تحليل لبيانات التعارضات المرورية في مواقع معينة من منظومة المرور. تم انجاز دراسة حالة للتعارضات المرورية لمواقع مختارة من تقاطعات ثلاثية مسيطر عليها باشارات ضوئية في مدينة بغداد. استخدم تحليل الانحدار لاستحداث نموذج رياضي يربط التعارضات المرورية ومعدل وقت التأخير. اعتمادا على مخرجات دليل السعة للطرق تم تقييم معالجات وحسب معدل وقت التأخير لما قبل وبعد الدراسة يمكن احتساب التعارضات المرورية المتوقعة وحسب النموذج المستحدث.النموذج الاحصائي المستحدث يبين ان ما نسبته 92.5 % من التعارضات المرورية الساعية يمكن توصيفها بدلالة معدل وقت التأخير. بالنتيجة فان ما يزيد على 35% من التعارضات المرورية المحتملة يمكن تقليلها باستخدام معالجات وان أعلى تقليل في التعارضات بما يقرب من 62.6 % ينتج عن زيادة عرض المسرب. تعظم الاستراتيجية المقترحة من فائدة التعارضات المرورية كأداة مستدامة للتنبأ بكفاءة أي معالجة وبالتالي تزيد مستوى السلامة في أي منظومة مرورية.

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