Calibration of Robertson's Platoon Dispersion Model in Non-lane Based Mixed Traffic Operation

Calibration of Robertson's Platoon Dispersion Model in Non-lane Based Mixed Traffic Operation

14 Pages · 2016 · 1.31 MB · English

Signalised intersections are the integral part of urban roadway system Manual (1984). McCoy et al. (1983). Robertson; Holroyd and Hiller (1969). Low Frictiona. Fig. 1 Best fit parameters of. Robertson's model. aPrimarily a sub-urban between platoon dispersion factor (a) and traffic volume does not

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ORIGINAL ARTICLE Calibration of Robertson’s Platoon Dispersion Model in Nonlane Based Mixed Trafc Operation Bhaskar Paul 1•Sudeshna Mitra 1•Bhargab Maitra 1 Received: 6 November 2015 / Accepted: 18 May 2016 / Published online: 1 June 2016  Springer International Publishing Switzerland 2016 Abstract Once released from a signalised stopline, vehi cles normally proceed to the next intersection in bunches (called as ‘platoon’) While moving along a corridor, vehicle platoons disperses and therefore, the pattern of vehicle arrivals at a signal is different from the pattern of discharge from its upstream signal Modelling of dispersion of vehicle platoon is an important consideration for coor dinated operation of closely spaced trafc signals In this regard, Robertson’s dispersion model has signicant con tribution towards design of coordinated signal system However, successful application of Robertson’s model largely depends on calibration of the model for local roadway and trafc conditions In this paper, calibration of Robertson’s model is carried out for an urban roadway scenario in India giving due consideration to level of heterogeneity in vehicle mix, variation in travel demand and link travel time Data are collected from an urban arterial in Kolkata metropolitan area using videography Using Robertson’s platoon dispersion model, downstream arrivals are predicted for observed upstream ow proles at stopline Then, parameters of the Robertson’s platoon dispersion model ( aand b) were calibrated using best t approach An empirical model is developed to express platoon dispersion factor ( a) as a function of vehicle composition, normalised ow (ow to capacity ratio at stopline), link travel time and modelling step size Keywords Robertson’s platoon dispersion model Mixed vehicular stream Calibration Empirical model Link travel time Vehicle group Introduction Signalised intersections are the integral part of urban roadway system Trafc operation at signalised intersec tions greatly inuences the overall performance of an urban roadway system Poor trafc control at signals may con tribute to delay, stop, bottleneck and accident Therefore, rational design of signal timing plan is necessary to improve the efciency of trafc operation as well as safety on urban corridors In delay based signal design, green splits are rationally allocated to conicting trafc movements to achieve a target volume to capacity ratio [ 1] However, effective utilisation of available green time is largely inuenced by the arrival pattern of vehicles at the stopline For an isolated trafc signal, back of queue or queue length which is one of the key performance measures is also affected by the vehicle arrival pattern [ 2] Vehicle arrival pattern plays an even more critical role in coordinated operation of closely spaced trafc signals Nonuniform arrival of vehicles at downstream stopline affect the utili sation of green split in coordinated phase thus may even cause additional delay to minor road approaches Hence, characterisation of vehicle arrivals at a signalised stopline is critical for design of signal timing plan Normally, the pattern of vehicle arrivals at a signalised stopline is distinctively different from the pattern of their discharge from upstream intersection [ 3] This is due to mutual interaction of the vehicles, and also their interaction with road side activities When, vehicles are discharged from an upstream stopline, they normally move towards & Bhaskar Paul [email protected] Sudeshna Mitra [email protected] Bhargab Maitra [email protected] 1 Civil Engineering Dept, Indian Institute of Technology,Kharagpur 721302, India 123 Transp in Dev Econ (2016) 2:11 DOI 101007/s4089001600167 downstream signal in bunches, each consisting of number of vehicles These moving bunches are termed as ‘vehicle platoon’ Once vehicles are released from the stopline, they initially move in a tight platoon with short time headways and tend to disperse as travelling further down stream [3–7] Variation in motorists’ desired speed is pri marily responsible for dispersion of vehicle platoons [6–8] Vehicle manoeuvring such as acceleration and decelera tion, maintenance of spacing and lane change, vehicle composition, roadway geometry (such as carriageway conguration, grade, curvature [7]), roadside activity (such as parking

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