Parameters of the intelligent driver model in signalized intersections

Abstract

Original scientific paper In the present paper the constant parameters of the (car following) Intelligent Driver Model are calibrated so as to obtain correct flow capacities of a signalized intersection. The calibration is based on measured time-headway parameters of the consecutive vehicles. The measurement data were taken from the work published by Dey et al. The parameters were calibrated partly by numeric calculations and partly by computer simulation, which was developed by the authors of this paper. The simulated environment was a single lane road terminated by a signalized intersection with a queue of stopped cars. As the result of the calibration, the model produced the measured saturated time-headway constant in the stationary flow phase and gave a good approximation of the consecutive time-headways in the initial transient phase. It was found that the calibrated constants of the Intelligent Driver Model considerably differ from the values proposed for modelling traffic on motorways: in a signalized intersection situation higher maximal acceleration and lower safe time gap parameters should be applied. More precisely, the differences are about 30 % in each case. Keywords: Intelligent Driver Model; signalized intersection; traffic simulation Parametri modela inteligentnog vozača u signaliziranim križanjimaIzvorni znanstveni članka U ovom su radu kalibrirani nepromjenjivi parametri Modela inteligentnog vozača (auta koji slijedi) kako bi se dobila točna propusna moć signaliziranog križanja. Kalibriranje se zasniva na izmjerenim parametrima intervala između dvaju vozila u nizu. Podaci mjerenja su uzeti iz rada u izdanju Dey et al. Parametri su kalibrirani djelomično numeričkim kalkulacijama i djelomično računalnom simulacijom, koju su razvili autori ovoga rada. Simulirano okruženje bila je traka koja je završavala signaliziranim križanjem s redom zaustavljenih vozila. Kao rezultat kalibriranja, model je davao izmjerenu konstantu zasićenja između dvaju vozila u nizu u fazi saobraćaja u mirovanju te je dao dobru aproksimaciju vremena između dvaju vozila u nizu u početnoj prolaznoj fazi. Ustanovljeno je da se kalibrirane konstante Modela inteligentnog vozača znatno razlikuju od vrijednosti predloženih za modeliranje prometa na autocestama: kad se radi o signaliziranim križanjima trebalo bi primijeniti parametre većeg maksimalnog ubrzanja i manjeg intervala sigurnog slijeda između dvaju vozila. Točnije, postoje razlike od oko 30 % u svakom slučaju. Ključne riječi:Model inteligentnog vozača; signalizirano križanje; simulacija prometa

Implementing the Intelligent Driver Model in a physical vehicle simulator

“…The IDM parameters were chosen to be s0 = 2 (m), v0=17 (m/s), a0=1.6 (m/s/s) (see eq. ( 1) and (2)), and the time gap parameter T was chosen to be 2.0 (s) (corresponding to the motorway case [1]) and 1.0 (corresponding to the jammed traffic-lamp case [9]). The parameter b, which characterizes the car's braking ability, is generally set to 2 (m/s/s).…”

Computer simulation of roundabouts

“…Recently the author of the paper participated in developing a traffic micro-simulator that is based on the Intelligent Driver Model [8], and has similar capabilities to those of VISSIM. This simulator was validated by measurements at traffic-lamp controlled intersections [9]. In this paper a development work is introduced that makes it possible to apply this self-developed software for simulating roundabouts accurately.…”

Vehicle Dynamic-based Approach for the Optimization of Traffic Parameters of the Intelligent Driver Model (IDM) and for the Support of Autonomous Vehicles’ Driving Ability

“…It can be said that the theoretical foundation and application [12] of IDM models is very good, however, the complexity [7,11] of real-world traffic processes poses serious problems to professionals in the applications. On the one hand, greater error tolerance than the accuracy of traffic parameters is to be expected than in many other dynamical systems.…”