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Influence of Traffic Flow of On-Ramps on the Mainline Speed on Freeways

Ru Han, Luan Jian, Ding Qingtao, Xu Jinliang

Archives of Transport

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2024

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Vol. 69, iss. 1

59--73

EN

Vehicles entering from on-ramps can increase the speed dispersion of the mainline and induce frequent changing lanes or acceleration and deceleration behaviors. These complex traffic behaviors interfere with traffic on the mainline and thus result in congestion and safety issues. Reasonable management and control of ramps, especially on-ramps, has been proven to be an effective solution for traffic congestion caused by ramp traffic flow. Understanding the influence of traffic flow of on-ramps on the average speed of the freeway mainline is useful for creating effective ramp management strategies. In this study, field tests were employed to gather traffic flow data on some typical basic freeway interchanges in China. As it is difficult to obtain the required traffic conditions only through field tests, the VISSIM traffic simulation model was also utilized. The same set of field data was used in VISSIM and the driver behavior model parameters CC0 (standstill distance between vehicles) and CC1 (time headway) were calibrated based on the sensitivity analysis to truly reflect the actual traffic conditions. The simulation program was executed with the calibrated parameters and various on-ramp traffic volumes to supplement the traffic data. The gathered traffic data sets from field tests and simulations were classified into four groups based on the various on-ramp traffic flow patterns (free-flow, reasonably free-flow, unstable flow, and congested flow condition). The influence of on-ramp traffic flow on the mainline average speed is discussed for each group. The results showed that the average travel speed of the mainline is significantly affected by the v/C ratio of the on-ramp, as the v/C ratio of the entrance ramp increases, the average travel speed of the mainline significantly decreases. Additionally, the four-parameter logistic model was developed to model the mainline average speed changes with different mainline v/C ratios under various on-ramp traffic flow patterns. The results demonstrate that the model fits the data well. The findings of this study can provide reference information for the implementation of ramp management strategies.

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Analiza stanu bezpieczeństwa ruchu drogowego na autostradzie A1 na odcinku przebiegającym przez województwo kujawsko-pomorskie

Kempa J., Bebyn G.

Autobusy : technika, eksploatacja, systemy transportowe

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2018

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R. 19, nr 6

121--126, CD

PL

W artykule omówiono stan bezpieczeństwa ruchu drogowego na autostradzie A1, na jej odcinku przebiegającym przez teren województwa kujawsko-pomorskiego. Przedstawiane dane dotyczą lat 2016-2017. Obecnie w Polsce autostrady charakteryzują się największymi wartościami ciężkości wypadków drogowych z wszystkich rodzajów dróg publicznych, o czym świadczą dane statystyczne Policji. Stąd niezbędne jest podjęcie skutecznych działań, których efektem musi być zdecydowana poprawa bezpieczeństwa ruchu drogowego na wszystkich autostradach w Polsce, w tym także na autostradzie A1, na jej przebiegu przez województwo kujawsko-pomorskie. W pracy przedstawiono strukturę rodzajową wypadków drogowych, czas ich powstania i okoliczności, stan nawierzchni spowodowany warunkami pogodowymi, a także przyczyny powstawania zdarzeń drogowych.

EN

The article discusses the state of road traffic safety on the A1 motorway, on its section passing the territory of the Kuyavian-Pomeranian Voivodeship. The presented data concerns the years 2016-2017. As it is evidenced by statistical data prepared by Police, motorways are characterized by the highest level of accidents rates of fatalities and injuries from all types of public roads at present in Poland. There-fore, it is necessary to take effective actions to improve road safety on all motorways in Poland, including the A1 motor-way passing the Kuyavian-Pomeranian Voivodeship. The paper presents the generic structure of road accidents, the time of their occurrence and circumstances, conditions of the surface caused by weather, as well as the reasons road accidents occurs.

3

Analiza stanu bezpieczeństwa na małopolskim odcinku autostrady A4 za okres 1 stycznia – 31 grudnia 2008 roku

Zgierski J.

Magazyn Autostrady

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2009

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Nr 10

58--61

PL

Bezpieczeństwo drogowe powinno być kwestią priorytetową dla wszystkich użytkowników dróg, jednak pomimo podejmowanych do tej pory działań liczba ofiar śmiertelnych wypadków drogowych pozostaje niezwykle wysoka. Poniżej przedstawiono dokładną analizę stanu BRD na małopolskim odcinku autostrady A4 za rok 2008.

EN

The road safety ought to be a matter of a top priority for every road user. However, despite all the undertakings implemented so far, the number of fatalities in road accidents still remains extremely high. Below, a thorough analysis is presented which investigates the situation in the Lesser Poland’s section of the A4 motorway.