Development of traffic stream characteristics models for intercity roads in Egypt

Sherief, Mohammad Mostafa El; Ramadan, Ibrahim; Ibrahim, Abobakr

doi:10.1016/j.aej.2016.04.031

Cited by 10 publications

(6 citation statements)

References 4 publications

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“…The developed models performed well at describing the relationship between traffic stream parameters. This result is similar to [21]. in southwest Nigeria have been investigated.…”

Section: Traffic Compositionsupporting

confidence: 87%

Traffic Stream Relationships of Two-Lane Highways: A Case of Akure-Ondo Road in Southwest Nigeria

Ipindola¹,

Falana²

2019

IJAEMS

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In the design and planning process of highway infrastructure, speed-flow-density relationships are useful tools for predicting the roadway capacity, determining adequate level-of-service of traffic flow and travel time for a given roadway. The speed-flow-density relationships currently used for transportation studies in Nigeria is derived from the Highway Capacity Manual, which does not reflect the true traffic situation on twolane roads in Nigeria. Developing cost effective tools for describing these relationships in the context of a developing country like Nigeria is imperative. The aim of this study was to develop models to describe the relationship between traffic flow, speed and density on Akure-Ondo two-lane highway in southwest Nigeria. Moving observer technique was employed to collect traffic stream data over a stretch of 5km on the study segment during periods of uniform flow on weekdays. To describe the traffic stream relationships, two approaches namely: related and nonrelated traffic stream models were developed. The nonrelated traffic stream models gave inaccurate relationships while the related traffic stream modelling approach performed well at describing speed-flow, flow-density and flow-speed relationships with R 2 values 0.62, 0.75, and 0.80 respectively. The relationships developed from related traffic stream models estimated maximum flow on the study segment as 330 veh/h at an optimum density of 4.44 veh/km. The speed at maximum flow was estimated as 74.5km/h, while the free flow speed was estimated as 149.027km/h.

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“…The developed models performed well at describing the relationship between traffic stream parameters. This result is similar to [21]. in southwest Nigeria have been investigated.…”

Section: Traffic Compositionsupporting

confidence: 87%

Traffic Stream Relationships of Two-Lane Highways: A Case of Akure-Ondo Road in Southwest Nigeria

Ipindola¹,

Falana²

2019

IJAEMS

View full text Add to dashboard Cite

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“…The increased and decreased of volume and density impact to the speed difference between vehicles. This data in which the road has 3.5% gradient was compared to the other data which represents the traffic on 0% of road gradient [4]. It shows a significant difference on the speed gap between the two types of vehicles (HV and non HV) for both gradients, particularly at the lesser traffic density.…”

Section: Speed Density and Volume Characteristicsmentioning

confidence: 94%

“…This speed difference created delays and reduce the traffic performance of the road [2]. The research then presented as traffic models which shows the correlation between speed, flow and density [3] [4]. Another study shows that due to speed difference, heavy vehicles need to have a special lane for it not only to improve the traffic performance but also for safety purpose [5].…”

Section: Introductionmentioning

confidence: 99%

The Empirical Study on the Impact of Road Gradient and Truck Composition on the Toll Road Traffic Performance

Nahry

Fadillah

2018

E3S Web Conf.

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The Jakarta Outer Ring Road (JORR) is a toll road system that circles the outskirts of Jakarta, where the purpose of this road is to reduce congestion on the street network of the city centre of Jakarta. However, the high composition of trucks in JORR resulted in congestion, and moreover it is suspected that the steep gradient of this road has contributed to this situation. This study aims to investigate the impact of road gradient on the trucks and the overall traffic performance from macroscopic view point. This study is the complement to a similar study that has been done in JORR previously, to confirm the result. The previous study was based on the Vissim simulation, while this paper will be entirely focused on an empirical study. Using the data obtained from 24-hour traffic recording on selected JORR sections that represent various gradients, traffic flow models are generated, and the effect of gradient could be assessed. The speed difference between trucks and nontrucks shows 56.2%~127% gap as the result of different gradient occurred. The overall free flow speed (uf) difference of different gradient is up to 27.3%. This result will benefit to the transport authority to justify the policy concerning the existence of trucks in the traffic flow, particularly in the condition at which trucks are regarded as a culprit of traffic congestion.

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“…Referred to [7], in this research a video-based approach was taken to detect more traffic conditions and facilitate the collecting of existing traffic data visually. The information was collected through 24-hour data recording on 75 m length of Cawang-Ancol-Pluit segment.…”

Section: Methodsmentioning

confidence: 99%

The impact of heavy vehicle’s composition to traffic performance of Jakarta Intra Urban Toll Road (JIUT) in macroscopic level

Yusuf

Wulandari

2019

MATEC Web Conf.

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Freight vehicle access restriction policy in 2011 has had an impact on the performance of Jakarta Intra Urban Toll way (JIUT) system. The statutory segment (Cawang-Tomang) of this toll road system seems to have better performance, but not for the advisory segment (Cawang -Ancol). Basically, heavy vehicles (HV) shift their routes to the advisory segment to avoid the statutory segment at which they are prohibited to access from 05.00 a.m. to 10.00 p.m.. This study aims to investigate the impact of the HV composition on the traffic performance of the advisory segment of JIUT. Data were obtained from 48 hours of traffic recording at a part of Cawang-Ancol segment. It was found that the Underwood Model (exponential model) can represent the relationship between the three main parameters of traffic flow on the advisory segment, i.e. volume, speed, and density. Based on the developed traffic flow models which are classified on the HV composition, it is shown that the free flow speed (uf) for HV composition < 6% (i.e. 144.91 km/h) is higher 35.41% than the one of HV > 6% (i.e. 107.02 km/h). The actual road capacity (qm) in HV composition < 6% (i.e. 4442 pcu/hour) also higher 12.83% than the one of HV > 6% (i.e. 3937 pcu/hour). The results will benefit to the transport authority to justify the truck access restriction implementation.

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Development of traffic stream characteristics models for intercity roads in Egypt

Cited by 10 publications

References 4 publications

Traffic Stream Relationships of Two-Lane Highways: A Case of Akure-Ondo Road in Southwest Nigeria

Traffic Stream Relationships of Two-Lane Highways: A Case of Akure-Ondo Road in Southwest Nigeria

The Empirical Study on the Impact of Road Gradient and Truck Composition on the Toll Road Traffic Performance

The impact of heavy vehicle’s composition to traffic performance of Jakarta Intra Urban Toll Road (JIUT) in macroscopic level

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