Study of vehicle speed in the design of roundabouts

Abstract

Some roundabout design elements significantly influence the vehicle driving speed, i.e. the trajectory of vehicles at roundabouts, which is directly responsible for the level of service and traffic safety at roundabouts. An "in situ" speed, taken as a significant roundabout-design element, is analysed in the paper using as an example four urban single-lane roundabouts located in the City of Zagreb. The American method and the Australian method are used for the definition and verification of the design speed at roundabouts. Results obtained show correlation between the design speed and the actual vehicle speed measured at roundabouts. Key words: single-lane roundabout, urban area, dimensioning and design, vehicle movement trajectory, vehicle speed Prethodno priopćenje Hrvoje Pilko, Davor Brčić, Nikola Šubić Istraživanje brzine kretanja vozila pri projektiranju kružnih raskrižjaPojedini oblikovni elementi raskrižja s kružnim tokom prometa značajno utječu na brzinu kretanja vozila koja ima izravan utjecaj na razinu usluge i prometnu sigurnost raskrižja. U radu se kroz prikaz četiri urbana jednotračna kružna raskrižja grada Zagreba, analizira brzina in situ kao značajan element pri projektiranju kružnih raskrižja. Za definiranje i provjeru projektne brzine primijenjene su američka i australska metoda. Rezultati istraživanja dovode u korelaciju projektnu brzinu sa stvarno izmjerenom brzinom vozila na kružnom raskrižju. Ključne riječi: jednotračno kružno raskrižje, urbana sredina, oblikovanje i projektiranje, trajektorija provoženja vozila, brzina kretanja vozila, sigurnost prometa Vorherige Mitteilung Hrvoje Pilko, Davor Brčić, Nikola Šubić Untersuchung der Fahrzeuggeschwindigkeit beim Entwurf von Kreisverkehrsplätzen Einzelne Elemente der Gestaltung von Kreuzungen mit Kreisverkehr beeinflussen bedeutsam die Fahrzeuggeschwindigkeit, bzw. den Fahrweg innerhalb des Kreisverkehrs, und haben eine direkte Einwirkung auf das Leistungsniveau und die Sicherheit der Kreuzung. In dieser Arbeit ist, mittels vier städtischer einspuriger Kreisverkehrsplätze in der Stadt Zagreb, die Geschwindigkeit "in-situ" als wichtiges Element im Entwurf analysiert. Die Berechnungsgeschwindigkeit im Kreisverkehr ist gemäß der amerikanischen und der australischen Methode berechnet. Die Resultate der Untersuchungen führen zur Korrelation dieser Berechnungswerte mit den gemessenen Geschwindigkeiten. Schlüsselwörter: einspuriger Kreisverkehr, städtisches Umfeld, Gestaltung und Entwurf, Fahrweg, Fahrzeuggeschwindigkeit Građevinar 5/2014 408 GRAĐEVINAR 66 (2014) 5, 407-416 Hrvoje Pilko, Davor Brčić, Nikola Šubić

Convolutional Neural Network for Driving Maneuver Identification Based on Inertial Measurement Unit (IMU) and Global Positioning System (GPS)

“…As the window size is always same for all the feature, the feature value is stable. On the other hand, the maneuver-based is a new way to test the approach, proposed by Pilko et al (2014) and Gonzalez et al (2017), here the concept of dividing the driving process in a roundabout into three stages: entrance, driving within the roundabout and exit maneuvers. To account for this maneuvers sequence, each dataset instance is built using a rolling window with three maneuvers as a window size.…”

Model of vehicle path radius at roundabout centre

“…Considering a wide variety of design practices, diversity of design vehicles, and general traffic culture and tradition differences, the application of procedures developed under conditions different from local ones may result in significant deviations of calculated speeds, when compared to actual speed values. The experimental speed tests carried out on roundabouts in Croatia show that measured speed values differ significantly from the speeds used to check consistency of geometric elements during design [12]. In addition, the recommended distances, based on which vehicle paths used in speed calculations are formed, differ significantly from the distances determined in field studies.…”

Calculation of an Average Vehicle’s Sideways Acceleration on Small Roundabouts

“…Many improvements in position accuracy were achieved using GPS/GNSS in comparison with GPS, especially for 10 Hz multi-GNSS. Meanwhile, the authors of [8] analyzed vehicle speed driving on an urban single-lane roundabout using both the abovementioned Dutch and American design models. It is important in roundabout design to ensure appropriate speed negotiation; therefore, the authors analyzed and compared the measured speed with the designed speed for the two mentioned models.…”