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Register a new userEffect of Vehicle Type on the Capacity of Signalized Intersections
تأثير أنواع المركبات المختلفة في سعة التقاطعات المزودة بإشارات ضوئية
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Damascus University ورقة بحثية
Publication date
2014
fields
Civil Engineering
and research's language is
العربية
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Shamra Editor
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هدف تقييم الوضع المروري الراهن و المستقبلي إلى تقدير مستوى الخدمة من خلال العديد من المؤشرات المرورية مثل (غزارة الإشباع، السعة، زمن التأخر و زمن الرحلة) علماً بأن هذه المؤشرات ترتكز بشكل أساسي على قياس المركبة الحسابية النموذجية. تطرق هذا البحث إلى تحليل تأثير أربعة أنواع مختلفة من المركبات على سعة التقاطعات المزودة بإشارات ضوئية،جمعت البيانات اللازمة من خمسة تقاطعات في مدينة دمشق و حسب (متوسط زمن التتابع و قيم مكافئ المركبة الحسابية النموذجية PCE) لكل نوع باستخدام طريقة زمن التتابع، و نتيجة لذلك تم بيان تأثير هذه الأنواع من المركبات في سعة هذه التقاطعات، و من ثم أَكَّد البحث ضرورة مراعاة هذه و مكافئاتها عند تحليل التقاطعات المزودة بإشارات ضوئية.
Evaluation of present and future traffic situation is carried out for estimating the level of service through a lot of traffic indicators (such as Saturation Flow, capacity, delay and travel time), but all these indicators are based primarily on the measurement of Passenger Car Unit (PCU) .This paper analyzes the impacts of four different types of vehicles on the capacity of signalized intersections. Data was collected at five intersections in Damascus city, and estimates of mean headways associated with four different types of vehicles, as well as passenger cars. Using the estimated headways, Passenger Car Equivalents (PCEs) were calculated, and these suggest that the impacts of these types should be given special consideration when analyzing the capacity of signalized intersections.
References used
Molina, C. J. Development of passenger car equivalencies for large trucks at signalized intersections. ITE Journal, November 1987
Webster, F. V. A controlled experiment on the capacity of junctions with traffic signals. Road Research Lab. Res. Note No. RN/3313/FVW. BR587, 1958
Webster, F. V. and B. M. Cobbe. Traffic Signals. Road Research Technical Paper No. 56, HMSO, London, 1966
Branston, D. and H. Van Zuylen. The estimation of saturation flow, effective green time and passenger car eqivalents at traffic signals by multiple linear regression. Transportation Research 12, 47-53, 1978
Al-Shiha, Mohammed A. Evaluation and optimization of traffic signal control at diamond interchanges in Arriyadh. M.Sc. thesis, Civil Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia, 1997
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The evaluation of the capacity of signalized intersections is one of the most important
parameter used in the planning, design, operation and management of urban street
networks. The calculation of capacity depends on the estimation of the saturati
on flow of
the signalized intersections.
The highway Capacity Manual (HCM 2010) is used to estimate and analyze the saturation
flow. This method is widely used in many countries around the world, including Syria. It
reflects the local conditions in the United States of America; therefore it may not be
suitable for use in our local conditions.
This study includes estimation of the field saturation flow depending on the headways
between the vehicles in the queues, and comparing the field results of the saturation flow
with the values resulting from using the HCM. The study was conducted on three
intersections in the Tartous city. The analysis was based on data collection using video.
The final results confirmed that there is a clear difference between the field measurement
of the saturation flow and computation value, Which confirms that it cannot be used for
our local conditions.
تهدف هذه الدراسة إلى بناء نموذج محاكاة على الحاسب الشخصي لمحاكاة حركة المركبات
المنعطفة يساراً و ذلك على التقاطعات الطرقية المضبوطة بإشارات ضوئية (برنامج بطورين).
آما تهدف إلى تحليل عدة حالات مرورية و إظهار نتائج الحسابات الخاصة لتحديد قيم عوامل
ا
لاستفادة من حارة المرور و تحديد قيم عوامل تأثير الانعطاف اليساري. كل هذا باستخدام
تقانة المحاكاة و نظرية الطوابير.
كل الافتراضات المطلوبة لبناء النموذج تم الحصول عليها من مراقبة سلوك السير العادي
على عدة تقاطعات طرقية في مدينة دمشق.
The experience was carried out at Abi-Jarash farm, Faculty of Agriculture,
Damascus University during the 2012 - 2013 growing season. During plant
growth, three fertilization treatments were applied (mineral, T1 organic, T2
and a combined of miner
al and organic fertilizers, T3). At harvesting, roots
were packed in three different ways (box, perforated polyethylene bags and
non-perforated polyethylene bags) and stored in 4-5˚C and RH 90% for 94
days.
The study was conducted at the Horticulture Department, Faculty of
Agriculture, University of Damascus, during the season of 2002 and 2003, in
order to study the effect of dipping apple fruits for the tow apple sorts for 5
minutes with some chemic
al substances, α-Tocopherol (0.25%) and
Prohexadion-Calcium (1%).
The fruits were stored at AlMaze cold storage unit under the normal
storage condition (0-1ºC, 93% R.H.), to find out some effects of these
treatments on some physical, chemical, and physiological changes of treated
and untreated apple fruits, especially: fruit weight, firmness, starch, and
soluble solids content.
Analysis of variance indicated a significant difference in storage ability of
both fruit apple samples in case of dipped fruits in Procalcium solution 1%
compared with control fruits. The tocopherol treated fruits were sometimes
significant.
The results showed a reduction in fruit weight in case of treated sample
during cold storage time. Fruit firmness was significantly better in both
treatments of procalcium 1% and tocopherol 0.25%compared with control,
and reducing physiological disorders during cold storage period.
Traffic Conflict Technique TCT has a long history in traffic safety researches. Traffic accidents are now
well known to generate a serious problem that exhausts enormous resources of the national economy
either directly or indirectly. Because signa
lized intersections are potential black spot locations that may
cause too many accident this research uses the traffic conflict techniques for analyzing accidents at
signalized intersections.
In this research, TCT was used at four-leg signalized intersections in Damascus to evaluate safety at these
intersections. The relationship between conflicts and accidents was estimated and the results indicated
that the conflicts and the accidents are related to each other by a linear regression. Results also showed
that the correlation was unclear between conflicts and entry volumes at the intersections. Additionally,
priority ranking of these intersections was developed based on risk index that depends on injury level.
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