Analysis of speed characteristics for rural two-lane roads: A field study from Minoufiya Governorate, Egypt

Hashim, Ibrahim H.

doi:10.1016/j.asej.2011.05.005

Cited by 54 publications

(34 citation statements)

References 3 publications

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“…Another study suggested that free flowing vehicles are those vehicles which travel with a 5‐s headway and 3‐s tailway value. For the present study, initially, graphs are plotted between ATS of the traffic stream and headway threshold values (headway value that are equal to or greater than a specific value) for all study sites as suggested by earlier studies . Similar graphs are plotted for the 85 th percentile speed of the traffic stream with the headway threshold value.…”

Section: Analysis and Resultsmentioning

confidence: 99%

A novel approach for assessing the LOS for two‐lane intercity highways under heterogeneous traffic conditions

Boora

Ghosh

Chandra

2016

J of Advced Transportation

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Performance of two-lane intercity highways has been evaluated in terms of level of service (LOS) by different researchers. Different follower-related performance measures, namely, the number of followers (NF), percent followers (PF), follower density (FD) and the number of followers as a proportion of capacity (NFPC) are examined in the present study to define LOS. Data are collected from five sites located in different parts of India. While almost all the past studies used 3-s headway rule to identify followers suggested by US Highway Capacity Manual, a new methodology is proposed in the current study to identify the followers by analysing speed difference (SD) and the gap between two consecutive vehicles. It is observed that vehicles travel in non-following condition after a critical gap threshold value of 10 s. By using a SD limit of À4 km/h to +10 km/h and a gap value of 10 s, followers are identified across all the study sites. Thereafter, different critical gap values ranging from 1.9 s to 4.3 s are observed at the study sites beyond which the probability of not following would increase. Variation in two-way traffic volume is found to be the main contributory factor which affects the critical gap values. Among all of the performance measures, NFPC shows a strong correlation with two-way traffic volume followed by FD under heterogeneous traffic condition. Finally, different threshold values of LOS ranges for two-lane intercity highways are provided by carrying out cluster analysis with the help of NFPC and FD.

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Section: Analysis and Resultsmentioning

confidence: 99%

A novel approach for assessing the LOS for two‐lane intercity highways under heterogeneous traffic conditions

Boora

Ghosh

Chandra

2016

J of Advced Transportation

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“…Figure 3 presents an example of the relationship between Flow Rate and Density at one of the study sites for one direction for both elements (tangent and curve); other sites show relatively similar patterns. The relationship shows that the traffic stream is in un-congested state, as these roads usually carry relatively low traffic volumes [12]. The relationships also show the impact of horizontal alignment/element type (tangent, horizontal curve) on traffic flow parameter.…”

Section: Data Collection and Preparationmentioning

confidence: 92%

Exploring the Relationship Between Highway Geometric Characteristics and Capacity Loss

Hashim¹,

Abdel-Wahed

2012

ERJ. Engineering Research Journal

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The main aim of this paper is to explore the impact of highway geometric characteristics on capacity at tangents and horizontal curves as well as on capacity loss at the change from tangent to curve. Vehicle speeds and flows on the two successive elements (tangent and curve) were recorded for each five-minute intervals during the survey period, for twelve rural two-lane road sites. A capacity estimation method based on extrapolation from a fundamental diagram representing the relationship between traffic flow and density was used. The effect of different vehicle types was considered by converting them into equivalent passenger car units. Regression analysis was used to investigate the relationships between geometric characteristics and capacity for tangents, curves and capacity loss between the two elements. The significant independent variables for tangents are lane width, shoulder width and tangent length. In the case of curves, the significant independent variables are curve radius and lane width. The best model that shows the relationship between capacity loss and geometry characteristics includes only curve radius. Based on this model, a curve radius with 600 m appears to be the threshold value to diminish the capacity loss between tangent and succeeding curve. The models are very useful and can be used to deal with capacity analysis and evaluation, especially for the area under study.

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“…Another study (Lobo et al 2011) was conducted on Portuguese two-lane rural roads to calculate the FFS, and a free gap of 6 seconds was found appropriate to calculate the FFS, as vehicles were travelling in a free condition beyond that gap value. In another study, Hashim (2011) analysed speed characteristics on two-lane rural highways in Egypt. From the study it was revealed that 85 th percentile speed did not vary after a critical headway value of 5 seconds, which indicates that vehicles will travel in FFC after 5 seconds headway value, and FFS can be calculated for headway value equal to or more than 5 seconds between two consecutive vehicles.…”

Section: Measurement Of Free-flow Conditions On Multilane Intercity Hmentioning

confidence: 99%

Measurement of free-flow conditions on multilane intercity highways under heterogeneous traffic conditions

Boora

Ghosh

Chandra

et al. 2018

J. S. Afr. Inst. Civ. Eng.

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Master of Technology (MTech) from the National Institute of Technology Kurukshetra (NIT) in 2012 on the topic "Effect of fly ash on the CBR value of different soils". He is currently a PhD research scholar at the Indian Institute of Technology (IIT) Roorkee, India, and is working on the topic "Operational performance measures for intercity roads". He has published more than ten research papers in reputed international journals and conference proceedings.

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Analysis of speed characteristics for rural two-lane roads: A field study from Minoufiya Governorate, Egypt

Cited by 54 publications

References 3 publications

A novel approach for assessing the LOS for two‐lane intercity highways under heterogeneous traffic conditions

A novel approach for assessing the LOS for two‐lane intercity highways under heterogeneous traffic conditions

Exploring the Relationship Between Highway Geometric Characteristics and Capacity Loss

Measurement of free-flow conditions on multilane intercity highways under heterogeneous traffic conditions

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