Operating Speed of Different Classes of Vehicles at Horizontal Curves on Two-Lane Rural Highways

Jacob, Anitha; Anjaneyulu, M. V. L. R.

doi:10.1061/(asce)te.1943-5436.0000503

Cited by 70 publications

(45 citation statements)

References 10 publications

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“…Now, curves with radius 500 m or less are considered as sharp (Figueroa Medina, Tarko 2005). Sharp horizontal curves affect the preferred speed (Fitzpatrick et al 2000a;Jacob, Anjaneyulu 2013;Russo et al 2016). Hence, any misjudgement in vehicle speed while entering a horizontal curve can turn out to be unsafe.…”

Section: Introductionmentioning

confidence: 99%

“…Researchers have used the absolute difference between design speed and operating speed (i.e., the 85th percentile free flow speed V 85 ) to evaluate geometric design consistency and safety of horizontal curves in highways (Lamm et al 1990(Lamm et al , 1998. The most related studies in developed countries as well as in devolving countries have used this criterion (Fitzpatrick et al 2000a;Jacob, Anjaneyulu 2013;Lamm et al 1990Lamm et al , 1998. Not all drivers do reduce speed while traversing a horizontal curve.…”

Section: Introductionmentioning

confidence: 99%

“…Russo et al (2016) reported that curves having radius more than 500 m do not influence driving performance in horizontal alignment. A study in India by Jacob and Anjaneyulu (2013) indicates that radius of 400 m or below influence the preferred speed on horizontal curves. Therefore, the present study considers sharp curves with radius 500 m or below for developing speed prediction model.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the present study considers sharp curves with radius 500 m or below for developing speed prediction model. Most of the available speed prediction models are developed for two-lane rural highways (Fitzpatrick et al 2000a(Fitzpatrick et al , 2000bLamm et al 1990Lamm et al , 1998Hashim et al 2016;Abdul-Mawjoud, Sofia 2008;Abbas et al 2011;Jacob, Anjaneyulu 2013;Memon et al 2008). Table 1 represents the summary of a few relevant models.…”

Section: Introductionmentioning

confidence: 99%

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Operating Speed Prediction Model as a Tool for Consistency Based Geometric Design of Four-Lane Divided Highways

et al. 2019

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Researchers have studied two-lane rural highways to predict the operating speed on horizontal curves and correlated it with safety. However, the driving characteristics of four-lane-divided highways are different. Weak lane discipline is observed in these facilities, which influences vehicle speed in adjacent lane or space. So, irrespective of its lane or lateral position, vehicles in four-lane divided highways are considered free flowing only when it maintains the minimum threshold headway from any lead vehicle. Examination of two conditions is proposed to ensure the free flow. Vehicles meeting both conditions, when tracked from the preceding tangent section till the centre of the horizontal curve, are considered as free flowing. The speed data of such free flowing passenger cars at the centre of eighteen horizontal curves on four-lane divided highways is analysed to develop a linear operating speed prediction model. The developed model depends on curve radius and preceding tangent length. The operating speed of passenger car in four-lane divided highways is influenced by horizontal curve of radius 360 m or less. Further, longer tangent would yield higher operating speed at the centre of the curve. Finally, two nomograms are suggested for conventional design, consistency based design and geometric design consistency evaluation of four-lane divided horizontal curves.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Operating Speed Prediction Model as a Tool for Consistency Based Geometric Design of Four-Lane Divided Highways

et al. 2019

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show abstract

“…The majority of research on operating speeds on two-lane highway tangent sections looked exclusively at passenger cars and/or did not consider heavy vehicles (e.g., Otteson and Krammes, 2000;Fitzpatrick et al, 2000;Jessen et al, 2001;Jacob and Anjaneyulu, 2013). Other research lumped passenger cars and heavy vehicles together and looked at an overall operating speed (e.g., Yagar and Van Aerde, 1983;Yagar, 1984;Figueroa and Tarko, 2005;Figueroa and Tarko, 2007).…”

Section: D1 Speeds On Tangentsmentioning

confidence: 99%