Recommendations for new capacity values on freeways

Fi, István; Galuska, János

doi:10.3311/pp.ci.2010-2.08

Cited by 3 publications

(4 citation statements)

References 5 publications

(5 reference statements)

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“…In Figures 6-20 the growth of traffic flow decreases average speed as noticeable earlier analyses [2]. Figure 5 shows the legend applied in the graphs that present the results.…”

Section: Results Of the Simulation Runsmentioning

confidence: 72%

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Analysis of on- and off-ramp types on highways

Kollar

2014

Per. Pol. Civil Eng.

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“…In Figures 6-20 the growth of traffic flow decreases average speed as noticeable earlier analyses [2]. Figure 5 shows the legend applied in the graphs that present the results.…”

Section: Results Of the Simulation Runsmentioning

confidence: 72%

“…Civil Eng. The formula (2) goes to show that the length of the diverging lane reduces the influence area density, thus the service level also improves with the length of the diverging lane.…”

Section: Highlights On the American (Hcm) Design Practicementioning

confidence: 99%

Analysis of on- and off-ramp types on highways

Kollar

2014

Per. Pol. Civil Eng.

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“…These usually occurred in traffic congestions where vehicles were moving slowly and traffic was mainly in stop-and-go situations, and drivers usually did not keep enough space between themselves and other vehicles [11]. Actually, traffic safety performance function (SPF), has a statistical relationship with congestion on urban freeways and observed safety, measured in the number of crashes over a unit of given time [crashes per kilometer per year (CPKPY)] and it varies with traffic exposure, measured in annual average daily traffic (AADT).…”

Section: Potential Causesmentioning

confidence: 99%

Practice Analysis of Road Traffic Crashes Accident of a City in China

Xiong

2012

AEF

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Abstract. Many studies focused on the development of crash analysis approaches have resulted in aggregate practices and experiences to quantify the safety effects of human, geometric, traffic and environmental factors on the expected number of deaths, injuries, and/or property damage crashes at specific locations. Traffic crashes on roads are a major cause of road crashes in the metropolitan area of Xi'an. In an attempt to identify causes and consequences, reported traffic crashes for six years in Xi'an were analyzed using a sample of 2038 reports. The main types of information from such reports were extracted, coded, and statistically analyzed. Important results were obtained from frequency analyses as well as multiple contributory factors related to traffic crashes, including crash severity, time and location of occurrence, geometry of the road, AADT and v/c. This paper presents the results of such analyses and provides some recommendations to improve traffic safety and further studies to analyze potential crash locations.

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“…For instance, as for "traffic operations" [1][2][3][4], it is well known how the presence of platoons can influence breakdown probability [5,6]. Moreover, platoon analyses turned out to be important also in the study of car accidents and road safety [7].…”

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confidence: 99%

Contribution to the platoon distribution analysis in steady-state traffic conditions

Mauro

Branco

Guerrieri

2014

Period. Polytech. Civil Eng.

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The traffic flow analysis and the relevant vehicle distribution ("free-moving" or "platooned" vehicles) IntroductionThe traffic flow composition and the relevant presence of vehicle platoons is particularly interesting in traffic study, and more generally in Highway Engineering, with reference to a plethora of theoretical and practical applications. For instance, as for "traffic operations" [1][2][3][4], it is well known how the presence of platoons can influence breakdown probability [5,6]. Moreover, platoon analyses turned out to be important also in the study of car accidents and road safety [7]. Such a very high practical interest accounts for the numerous models developed over the years. By way of an example, it is worth mentioning the research conducted by Baras et al. [8], which also considers facilities with interrupted flow -and the most recent studies by Ramezani et al. [9] and Jiang et al. [10]. Still today, therefore, the topic has a remarkable scientific and practical interest and deserves in-depth analysis.At first, this article briefly describes the Pearson type III distribution which represents a time headway probability model (more specifically, a generalized mathematical model). The peculiarity of the Pearson type III distribution is its capacity to generate distribution families depending on the chosen model parameters, which can be suited to a plethora of types of traffic phenomena. In the course of this research, some of the above formulations were used to analyse a vehicle distribution within a traffic flow in steady-state conditions and notably to identify the presence and composition of vehicle platoons. In order to apply this analysis to a great number of observations, a specific algorithm was designed and calibrated according to empirical surveys, suitable to randomly simulate a traffic flow and to "identify" the essential characteristics of any present vehicle platoon. The algorithm was implemented to generate realizations of the random function Q(t) (i.e. a traffic flow on a road cross-section in function of time t) starting from input data. The resulting random functions were properly studied and their main characteristics (i.e. non-random functions: mathematical hope and variance) were determined to confirm the steady state flow hypothesis assumed for the development of this study.

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Recommendations for new capacity values on freeways

Cited by 3 publications

References 5 publications

Analysis of on- and off-ramp types on highways

Analysis of on- and off-ramp types on highways

Practice Analysis of Road Traffic Crashes Accident of a City in China

Contribution to the platoon distribution analysis in steady-state traffic conditions

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