Development of Vehicle Platoon Distribution Models and Simulation of Platoon Movements on Indian Rural Corridors (original) (raw)
Related papers
Research Paper on Study of Platoon Dispersion Behavior at Urban Intersection
This study will analyse the effect the road traffic and travel situation is highly aggravated in metropolitan cities of developing country like India because of significant growth in traffic and addition of more and more numbers of vehicles year by year in to the stream with wide ranging static and dynamic characteristics. Signalisation is a traffic control strategy to ease the competition by providing right of way in a cyclic manner to conflicting traffic at intersections. Saturation flow is a major component in the design of signals, and is influenced by a variety of factors like vehicle composition, intersection geometry and driver's behaviour. Two-wheelers (2W) constitute a major proportion of urban traffic and therefore their effect on the saturation flow could be substantial. The highway capacity manual (HCM) has recommended a saturation flow model primarily for homogeneous conditions, with limited ability to address heterogeneity. But the traffic in India is highly heterogeneous and hence, defining a unified saturation flow concept is a challenging task. The variability in vehicle types necessitates the use of passenger car units (PCUs).Mixed traffic behaviour on saturation flow rate at the signalised intersections. Traffic data will be collected at signalised intersections located in urban area of different cities of Gujarat with different geometric configurations and approach width. Micro level discharge rate studies will be carried out by observing different traffic attributes. The passenger car units (PCUs) values will be derived for different types of vehicles in the traffic stream by different approaches. Mixed traffic discharge flow models will be developed using regression method by relating the various parameters. Also an effect of platoon dispersion on discharge rate will be carried out under this study.
Modeling Platoon Dispersion at Signalized Intersections in Mixed Traffic Scenario
Arabian Journal for Science and Engineering, 2018
Vehicles generally move in the form of platoons after discharging from the stop line of signalized intersection. While moving toward the downstream signal, due to the interaction between moving vehicles, road geometry, traffic composition and their speed difference, platoons get dispersed. Dispersion of platoon influences signal coordination , arrival pattern, turning maneuver at upstream signal. Moreover, while designing the intersection under mixed traffic scenario, platoon dispersion is important to create a link between traffic signals. Therefore, the present study is taken up with the objective of estimating the platoon dispersion distance after crossing the stop line. A model is developed based on the simulated data sets. VISSIM, a micro-simulation software, is used to replicate the field traffic conditions. To ensure the applicability of the model in the existing mixed traffic conditions, two different methods were used. Firstly, data were collected from two sites and used for validating the performance of the model. The results indicated a good match (maximum 9% error) between the field-observed and model-estimated platoon dispersion distance. Secondly, the traffic scenario alike the two study sites was created in VISSIM and the simulated and field-observed data sets were compared to check how accurately VISSIM can replicate the existing mixed traffic conditions. It is observed that VISSIM had replicated the field conditions with a maximum error of 10%. Therefore, the output of the study indicates that the proposed model may be used to estimate the platoon dispersion distance with reasonably high accuracy under mixed traffic conditions.
Simple platoon advancement: a model of automated vehicle movement at signalised intersections
The Simple Platoon Advancement (SPA) model describes a conceptual Intelligent Transportation System in which vehicles are progressed through signalised intersections under the automatic control of roadside and in-vehicle infrastructure. The objective is to increase the throughput of vehicles by moving the queue as a closely-spaced platoon on the start-of-green. Comparisons of stopline throughput are made between the SPA model and a valid representation of current road traffic behaviour. The paper contains a description of a basic model-the homogeneous SPA model with constant acceleration-where all vehicles behave the same in terms of their acceleration characteristics, the time headway they desire and the target speed each is trying to reach after passing through the intersection. The acceleration characteristics in question are the rate and the style: that of this model has no smoothing effect and is instantaneously wrought on a vehicle. Though this is somewhat unrealistic for a working system, the constant acceleration model serves as a yardstick for which to check and compare the development of future models. The framework for this model is defined to enable calculations of measurable goals such as stopline throughput for comparison with the EQD model of current road traffic behaviour. In terms of throughput, the homogeneous SPA model shows that even with a very cautious approach using conservative parameter values, the number of vehicles that would pass the stopline of a SPA-equipped intersection is a little more than 150% compared with the throughput found in todayÕs road systems. Reductions in jam spacing increase the throughput still further.
Periodica Polytechnica Transportation Engineering, 2022
The existence of different types of Commercial Vehicles (CVs) in the shared roadway affects traffic flow characteristics differently from other vehicles. Owing to the uncertain placement and movement of these CVs in both longitudinal and lateral directions, the opportunities for lane changing and overtaking by other vehicles with lower maneuverability decrease, resulting in the formation of platoons. The study's primary aim is to assess the effect of mixed traffic platoons formed by three different classes of CVs on highway traffic speed, flow, and density under two different traffic regimes (regimes A and B). In this study, regime A represents the non-platooning condition, and regime B represents the platooning condition. Bi-directional traffic data was collected from the highway sections in India using an Infra-Red sensor-based device. The critical leading time headway is determined for the different CVs (platoon leaders) based on the mean absolute relative speed of platoons. The speed-flow-density plots are established using the macroscopic fundamental diagrams for the highway sections under regimes A and B to quantify the platooning impacts of CVs on the traffic characteristics. The study findings reveal that the speed at capacity, density at capacity, and traffic capacity decreased significantly due to CVs' influence on the general traffic mix during the mixed traffic platooning conditions. However, this effect was found to be relatively higher during the Heavy Commercial Vehicle operation as a platoon leader compared to Medium Commercial Vehicle and Light Commercial Vehicle as a platoon leader.
European Transport \ Trasporti Europei, 2020
The study aims to investigate the impact of heavy vehicles (HVs) on traffic characteristics under platoon conditions on Indian highways. Traffic volume, speed, and time headway data were gathered from different highway sections using infra-red sensors. The mean relative speed criteria were used as an indicator of variability to estimate the critical time headway. The threshold value of a critical time headway of 4 sec was determined to represent vehicles into non-platoon followers and platoon followers. The speed-flowdensity model curves were developed for two different traffic regimes, one without platoons and the other with platoons created by the HVs. The results show that under platoon conditions, the speed at capacity, density at capacity, and traffic capacity reduced by 11.2%, 12.5%, and 22.3%, respectively, compared to non-platoon conditions. Additionally, the average travel time and travel delay increased by 18.1 s/km and 12.7 s/km, respectively. The study's findings emphasize the importance of considering platoon dynamics under the influence of HVs to better understand their impact on traffic characteristics.
Experimental Survey and Modeling for the Driver Behavior in Vehicle Platoons
Procedia - Social and Behavioral Sciences, 2014
The objective of this paper is study the driver behaviors in the vehicle platoons starting from a traffic light. This study i s necessary to model the changes in the shape of the vehicle platoons at different sections along the road. It is need to understand these changes in order to define an adequate programming of the traffic light phases. The study started from a survey of traffic flows on a road section of about 650 m.: all vehicles have been followed from the start section and for each of them were recorded the transit times on next sections at known distance. The data have been analyzed with two different methods: Cyclic Flow Profiles and the Weibull distribution. The calibrated CFP, with correct parameter values, well represent the trend and the dispersion of vehicle platoons at the observed road section. The Weibull distribution, basic used to describe life-time reliability characteristics in model failure testing, can be a powerful tool also for the prediction of vehicle platoons on the road sections. Fact, starting from the flow study in a number of sections, it is possible to know the trend of distribution parameters as function of the start distance. The variation of two parameters along the road from the first section (first signal light) appears to be linear for the first parameter (position), almost linear for the second (form).
Analysis of Platoon Impacts on Left-Turn Delay at Unsignalized Intersections
Transportation Research Record: Journal of the Transportation Research Board, 2011
This research aimed to develop a methodology for analyzing the platoon impacts on major-street left-turn (MSLT) delay at two-way stop-controlled intersections. The main idea was to use a microscopic simulation tool to simulate different platoon scenarios in opposing through traffic and then to apply regression models to capture the impacts of platoons on the delay of MSLT. Two platoon variables were adopted as a simplification of the complex platoon scenarios to make analysis of the platoon effects on MSLT delay practical. The first two steps were to build simulation models for real-world unsignalized intersections and simulate scenarios with a combination of various factors related to platoons in VISSIM simulation. The models were calibrated with field data before simulation started. The next step was to define, derive, and calibrate two platoon variables for describing the duration and intensity of platoon arrivals in the opposing through traffic. This process effectively simplifi...
Transportation Research Record: Journal of the Transportation Research Board
Truck platooning is the application of cooperative adaptive cruise control where multiple trucks are electronically linked using vehicle-to-vehicle communication. Although truck platoons might bring fuel savings and emission reductions, their interactions with surrounding traffic and resulting impact on traffic operations and safety are not fully understood. The objective of this paper is to evaluate traffic efficiency and safety in a critical traffic situation when truck platoons are introduced in the system. This paper presents a case study of a merging section, located on A15 motorway, near the port of Rotterdam in the Netherlands. We consider two scenarios: platoons on a mainline carriageway and platoons merging onto a mainline carriageway. We simulate the movements of truck platoons in a microscopic traffic simulator. Longitudinal and lateral controllers for truck platoons, proposed in this paper, can ensure their collision-free, string-stable, and smooth driving behavior. Simu...