Effect of Highway Geometric Characteristics on Capacity Loss

Hashim, Ibrahim H.; Abdel-Wahed, Talaat

doi:10.1016/s1570-6672(11)60223-7

Cited by 14 publications

(14 citation statements)

References 12 publications

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“…Hashim [13] developed a regression based model to estimate capacity loss between tangent and curved sections. This loss decreases as the radius of curve increases [13]. The main reason of capacity loss can be attributed to reduction in vehicle speed.…”

Section: Literature Reviewmentioning

confidence: 99%

Vehicle Speed Characteristics and Alignment Design Consistency for Mountainous Roads

Nama

Maurya

Maji

et al. 2016

Transp. in Dev. Econ.

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Vehicle drivers continuously make decisions and execute them while driving on a roadway. It requires perception, comprehension and prediction of roadway conditions. Studies show that the decision-making process and driver performance greatly depends on situational awareness. Drivers intend to operate vehicles at safe speed based on the roadway geometric features. These features are characterized by gradient, horizontal curvature, length of curves and tangent sections, superelevation, etc. Perceptive and consistent geometric characteristics of the roadway can ease the decision making burden and thus minimize driver error. So far, majority of the studies on geometric design consistency are conducted on isolated curve sections in plain terrain for traffic with strong lane discipline. The effect of gradient is not significant in these terrains. Further, the driving behavior of traffic with weak lane discipline is not represented in these studies. Hence, the aim of this paper is to study geometric consistency of roadways on mountainous terrain for traffic with weak lane discipline characteristics using existing consistency based safety evaluation methods. Isolated horizontal curves with horizontal curvature, length of curve and gradient are considered for the purpose. Sixteen sites in a mountainous terrain with distinct horizontal alignment and vertical profile features are chosen on a four-lane divided National Highway 40 in India. The obtained results indicate that 79 % and 93 % locations exhibit good level of consistency as per Lamm's Criteria I and Criteria II, respectively. It is also observed that average vehicle operating speed at most of the locations exceeds the design speed. Keywords Geometric design consistency Á Horizontal curve Á Vertical gradient Á 85th percentile speed Á Mountainous terrain

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Section: Literature Reviewmentioning

confidence: 99%

Vehicle Speed Characteristics and Alignment Design Consistency for Mountainous Roads

Nama

Maurya

Maji

et al. 2016

Transp. in Dev. Econ.

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“…The first one isthe capacity at midpoint of the curve and the second is the capacity loss between the curves and tangents. The existence of the horizontal curves surely forces the drivers to reduce their speed; consequently, the traffic flow clearly decreases and so, the capacity value of this site will drop significantly, Hashim and Abdel-wahed [4]. However, the results of the present paper can help the Egyptians road responsible to evaluate the right lane capacity of various horizontal curves on Egyptian multi-lane highways and evolve the proper traffic behaviour in the future.…”

Section: Introductionmentioning

confidence: 82%

“…The horizontal curve surely forces the drivers to reduce their speed; consequently, the traffic flow will clearly decrease [4]. So, the capacity value of the horizontal curve is significantly lower than that at tangent under the same road and traffic properties.…”

Section: Capacity Loss (Closs)mentioning

confidence: 99%

Impact of Horizontal Curves and Percentage of Heavy Vehicles on Right Lane Capacity at Multi-lane Highways

Semeida

2017

PROMET

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“…ANN model is performed higher statistical analysis. (Hashim Ibrahim Hassan, Abdel-Wahed Talaat Ali) [18] Carried out effect of highway geometric characteristics on capacity. They considered lane width, shoulder width, and tangent length and also consider horizontal curve.…”

Section: Literature Surveymentioning

confidence: 99%

A Review on Capacity and Level of Service for Urban Road

2017

IJAERD

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Effect of Highway Geometric Characteristics on Capacity Loss

Cited by 14 publications

References 12 publications

Vehicle Speed Characteristics and Alignment Design Consistency for Mountainous Roads

Vehicle Speed Characteristics and Alignment Design Consistency for Mountainous Roads

Impact of Horizontal Curves and Percentage of Heavy Vehicles on Right Lane Capacity at Multi-lane Highways

A Review on Capacity and Level of Service for Urban Road

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