• Title/Summary/Keyword: platoon

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A Method for the Development of Design Guides for Passing Lenes on Rural Two-Lane Highways (지방부 도로의 양보차선 설계기준 정립을 위한 이론적 연구)

  • 최재성
    • Journal of Korean Society of Transportation
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    • v.11 no.3
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    • pp.67-82
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    • 1993
  • The effects of passing lanes on traffic flow on rural two-lane highways have been investigated in this research. Field study results were compared with the computer simulation model, TRARR, TRARR model appears to be in good agreement with field study results except that average speed and distribution of platoon sizes showed a small amount of discrepancy, which is believed to be caused by too large a headway definition of 6 second for a vehicle platoon. Using the TRARR model, 4 situations including the existing condition, installation of passing lanes, improvement of design speed, and expansion to a four lane highway were evaluated. Traffic volume levels of 500,1000, and 1500 vph and truck composition of 20 and 40% were also considered making a total of 24 computer runs. It is concluded in this research that the installation of passing lanes is the most effective method to improve traffic operation on two-lane high ways except the alternative of four lane highway expansion.

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Two tales of platoon intelligence for autonomous mobility control: Enabling deep learning recipes

  • Soohyun Park;Haemin Lee;Chanyoung Park;Soyi Jung;Minseok Choi;Joongheon Kim
    • ETRI Journal
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    • v.45 no.5
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    • pp.735-745
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    • 2023
  • This paper surveys recent multiagent reinforcement learning and neural Myerson auction deep learning efforts to improve mobility control and resource management in autonomous ground and aerial vehicles. The multiagent reinforcement learning communication network (CommNet) was introduced to enable multiple agents to perform actions in a distributed manner to achieve shared goals by training all agents' states and actions in a single neural network. Additionally, the Myerson auction method guarantees trustworthiness among multiple agents to optimize rewards in highly dynamic systems. Our findings suggest that the integration of MARL CommNet and Myerson techniques is very much needed for improved efficiency and trustworthiness.

The Effect of Single-Entry Metering and Platoon Metering on Mainstream under the Same Metering Rate with Pre-timed Metering (정주기식 동일 미터링율 제어에서 차량진입방식에 따른 효과분석)

  • Kim, Sang-Gu;Ryu, Ju-Hyeon
    • Journal of Korean Society of Transportation
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    • v.28 no.3
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    • pp.29-37
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    • 2010
  • Ramp metering control is the most representative strategy of uninterrupted flow control and management system. Ramp metering is to adjust vehicles entering an expressway in such a way that expressway mainline maintains flow stability by regulating ramp vehicles. The effect of two metering strategies, single-entry metering and platoon metering, on mainstream under the same metering rate with pre-timed metering are analyzed by micro-simulation. Platoon metering shows lower performance than single-entry metering under the same metering rate in terms of speed, density, and delay, causes earlier breakdown than single-entry metering. It indicates that the selection of metering type has critical importance as the flow of mainline is high.

An Approach to Calibrating a Progression Adjustment Factorat Signalized Intersections - Toward Theory of Background - (신호등(信號燈) 연동화보정계수(連動化補正係數) 산출(算出) 모형(模型)의 개발(開發) - 이론적(理論的) 고찰(考察)을 중심(中心)으로 -)

  • Lee, Yong Jae;Choi, Woo Hyuck
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.14 no.3
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    • pp.379-390
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    • 1994
  • The recent study of the delay models have assumed random arrival which has a constant average flow rate throughout the cycle. However, where signals are spaced closely together or form part of progressive system, platoon flows are common and more closely represent reality. In such cases, those results are quite different pattern of estimated delay from that of observed one. In order to solve this problem, the 1985 HCM takes Progression Adjustment Factor (PAF) into account. In the 1985 HCM, however, it has deficiencies in defining and applying it, such as platoon ratio ($R_p$) and platoon arrival type. The Purpose of this study is to investigate theoretically the predictive ability of the individual models concerned through comparing the estimated delay and PAF suggested by NCHRP Report 339, KHCM or USHCM (1985) with the observed obtained by field survey at a signalized intersection.

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A Study on the Analysis of Relational to Using Status and Connection with Space in Public Space of Platoon Kunsthalle (플래툰 쿤스트할레의 공공공간의 사용자현황 및 공간과의 관계 분석에 관한 연구)

  • Yi, Bo-Hyeon;Suh, Kuee-Sook
    • Korean Institute of Interior Design Journal
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    • v.20 no.5
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    • pp.217-225
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    • 2011
  • The meaning and role of public space has existed based on the periodical situation like history. The more the time has passed, the faster the meaning of it has changed. We can see the differences of it from the one which used to be. This study is about Platoon Kunsthalle which is so-called the complex cultural space. The purpose of this study is to show how the user is related to the program for the planning of the public space. It is based on the procedure of the research with absorbing the place. The people who are using the space are absorbed for knowing the user's action. And then, the specific actions are written and the status of the using space is photographed. The research is based on asking and answering about that. The result of this study is as follows : The first is that young people between 20's and 30's are using a hall comparing with other age through daily using of space and features of users. Also, Using between 7p.m. and 9p.m., a dinnertime, takes the first place and using of meals and beverages is major at lunch due to restaurant and bar. User behavior of "sitting" is the biggest part and the hall is used for the public purpose connected with "talking". The second is that the daily hall space is classified with the spacial area indirectly based on the condition. Also, it depends on the time and the using. The third is that the unusual hall space is depended on the program which is the role of leading the extention of using the space. That is why the program is important because it is effected directly to the way of using the space and the place of the furniture. I am looking forward that this study is the basic data for the planning of the public space in the complicated culture.

Processing the Data from the uTSN of Uninterrupted Traffic Flow (연속류 uTSN 수집 데이터 가공 방안)

  • Park, Eun-Mi;Suh, Euy-Hyun
    • Journal of Intelligence and Information Systems
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    • v.16 no.1
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    • pp.57-69
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    • 2010
  • The ubiquitous transportation system environments make it possible to collect each vehicle's position and velocity data and to perform more sophisticated traffic flow management at individual vehicle or platoon level through V2V and V2I communication. It is necessary to develop a new data processing methodology to take advantage of the ubiquitous transportation system environments. This paper proposed to build 3-dimension data profiles to maintain the detailed traffic flow information contained in the individual vehicles' data and at the same time to keep the profiles from the meaningless fluctuations. Also methods to build the platoon profile and the shock wave speed profile are proposed, which have not been possible under ITS(Intelligent Transportation System) environments.

Design of a Stabilizing Controller for Hybrid systems with as Application to Longitudinal Spacing Control in a Vehicle Platoon (다중 Lyapunov 기방 하이브리드 시스템에 안정화 제어기 설계 및 군집 차량의 종방향 거리 제어시스템의 용용)

  • Kim, Jin-Byun;Park, Jae-Weon;Kim, Young-Ho
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.6
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    • pp.477-486
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    • 2001
  • Many physical systems can be modeled by incorporating continuous and discrete event nature together. Such hybrid systems contain both continuous and discrete states that influence the dynamic be-havior of the systems. There has been an increasing interest in thers types of systems during the last dec-ade, mostly due to the growing usage of computers in the control of physical plants but also as a result of the hybrid nature of physical processes. The stability theory for hybrid systems is considered as extension of Lyapunov theory where the existence of an abstract energy function satisfying certain properties verifies stability, called multiple Lyapunov theory. In this paper, a hybrid stabilizing controller is proposed using the control Lyapunov function method and multiple Lyapunov theory, and the proposed method is applied to lon-gitudinal spacing control in a vehicle platoon for intelligent transportation systems(ITS).

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Road Safety Assessment by Using Integrated Evaluation Methods of Road Design Consistency (도로선형 설계일관성 통합평가방법론을 활용한 안전성 평가)

  • Ko, Chun-Soo;Lee, Jong-Hak;Ku, Ji-Sun;Noh, Kwan-Sub
    • International Journal of Highway Engineering
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    • v.15 no.1
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    • pp.121-126
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    • 2013
  • PURPOSES: Road Design Consistency Evaluation can guarantee road alignments with safety factors, however it can be hard work to deal with general car accident factors in only this evaluation index. Ideal Road Design Consistency Evaluation is show the mutual balance of road alignment and human factors with a variety of factors for road safety. METHODS: This study carried out overall road safety evaluations which are methods of running speeding consistency and car platoon safety analysis (driver's behaviors factors) as well. RESULTS: Out of 13 sections in a experimental road layout, safety factors of 8 sections showed 'Good' or 'Fair' status. However, 'Poor' results were found out in 5 sections. Particularly, it showed the different outcomes among the 4 evaluation methods used in this study. CONCLUSIONS: Road safety countermeasures were proposed for the potentially dangerous sections in road which failed to identify in the other methods. This study will contribute toward future study of more reliable Road Design Consistency Evaluation in the future for road safety.

Preventive Congestion Management Algorithm for Ubiquitous Freeway System (유비쿼터스 교통환경을 위한 연속류 정체예방관리 알고리즘)

  • Park, Eun-Mi
    • Journal of Korean Society of Transportation
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    • v.27 no.3
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    • pp.161-168
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    • 2009
  • The ubiquitous transportation system environments make it possible to collect each vehicle's position and velocity data and to perform more sophisticated traffic flow management at individual vehicle or platoon level through V2V and V2I communication. It is necessary to develop a new traffic management paradigm to take advantage of the ubiquitous transportation system environments. This paper proposed a preventive congestion management algorithm for uninterrupted flow, whose goal is to minimize the incident potential and maximize the productivity by maintaining traffic flow stability. The algorithm includes the following steps: Processing the raw data to produce the 3-dimension speed/flow/density profile and to produce the platoon profile and the shock wave profile, Determining the traffic state and the flow stability based on the processed data, Deciding the desirable speed the according the traffic flow state, and finally Providing the desirable speed information. It remains as further work to perform field experiments and calibrate the algorithm parameters.