Modelling Free Flow Speed on Two-Lane Rural Highways in Bosnia and Herzegovina

Lovrić, Ivan; Cvitanić, Dražen; Breški, Deana

doi:10.7307/ptt.v26i2.1232

Cited by 6 publications

(3 citation statements)

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“…The conclusion regarding the significance of the impact of horizontal curves on flow speed is in accordance with the results obtained in the majority of studies, e.g. [9,11,29] etc. It can be explained by the acting of centripetal force on the vehicle and by poorer sight distance, which makes drivers slow down at low radius values.…”

Section: Determining Free-flow Speed Predictorssupporting

confidence: 90%

“…Numerous studies examined the impact of geometric characteristics of the road on free-flow speed, e.g. [11,13,29]. Medina and Tarko [11] conducted a study taking into account not only speed limits but also the impact of mean speed, speed dispersion and geometric characteristics on free-flow speed on rural two-lane highways.…”

Section: Analysis Of Free-flow Speed Predictorsmentioning

confidence: 99%

“…They showed that the deterioration of the pavement led to the linear reduction of free-flow speed, particularly for different categories of passenger cars. Lovrić and Breški [29] developed an adequate model for calculating free-flow speed on rural two-lane highways in Bosnia and Herzegovina and determined that the following variables had a statistically significant impact on free-flow speed: degree of horizontal curvature, traffic lane width and average longitudinal grade. The first two variables had the greatest impact on free-flow speed.…”

Section: Analysis Of Free-flow Speed Predictorsmentioning

confidence: 99%

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Determining Free-Flow Speed on Different Classes of Rural Two-Lane Highways

Stepanović

Tubić

Zdravković

2023

PROMTT

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Current analytical free-flow speed models consider all rural two-lane highways as the same road type despite their different functional significance in the network. The aim of this paper is to develop a prediction model for free-flow speed as a function of speed limit and road geometric characteristics for different classes of rural two-lane highways. The research was conducted on 50 representative sections of the two rural classes of two-lane highways equipped with automatic traffic counters in Serbia. In order to develop the appropriate models, it was necessary to determine the threshold values of vehicle time headway in the free-flow for both classes of rural two-lane highways, based on the total number of 191,720 vehicles. The obtained results show that there are differences in the threshold values of free-flow time headway for different road classes. Namely, it was determined that the values of free-flow time headway for Class I amounted to 6.3 s, and for Class II to 8.4 s. The free-flow speed prediction model for different road classes showed that speed limit had the highest impact on free-flow speed for Class I and II highways, followed by horizontal curve radius and shoulder width.

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Section: Determining Free-flow Speed Predictorssupporting

confidence: 90%