2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC)最新文献_第4页

Comparing two countdown pedestrian signal displays in the District of Columbia 比较两个倒计时行人信号显示在哥伦比亚特区

2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC) Pub Date : 2011-11-18 DOI: 10.1109/ITSC.2011.6083038

S. Arhin, E. C. Noel, M. Lakew

{"title":"Comparing two countdown pedestrian signal displays in the District of Columbia","authors":"S. Arhin, E. C. Noel, M. Lakew","doi":"10.1109/ITSC.2011.6083038","DOIUrl":"https://doi.org/10.1109/ITSC.2011.6083038","url":null,"abstract":"According to the Manual on Uniform Traffic Control Devices (MUTCD), Countdown Pedestrian Signals (CPS) shall only be displayed during the clearance interval (FLASHING DON'T WALK — FDW) of pedestrian signals. The primary purpose of this CPS display is to inform pedestrians of the remaining time for crossing a road controlled by the signal, to discourage them from starting, and to inform those who are already on the way of the remaining time before the beginning of the DON'T WALK (DW) interval. The general literature on CPS is conclusive that CPS is better understood than the conventional pedestrian signals. In the District of Columbia the CPS display starts at the onset of the Steady WALK (SW) interval and continues through the FDW interval. It is not certain whether this CPS display has any advantage over the standard display as prescribed by the MUTCD. In this research a comparative field study of both types of countdown displays at twenty-five (25) intersections in the District of Columbia was conducted. The results of the evaluation showed that at the majority of the intersections studied, there were no statistically significant differences in pedestrian crossing behaviors (using 5% significance level) due to the type of CPS display.","PeriodicalId":186596,"journal":{"name":"2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC)","volume":"384 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116006635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Layered Semi-Markov road generation for driving simulations 分层半马尔可夫道路生成驾驶模拟

2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC) Pub Date : 2011-11-18 DOI: 10.1109/ITSC.2011.6082820

S. Ostadabbas, Masoud Farshbaf, M. Nourani, Sateesh Addepalli

引用次数: 3

Traffic speed forecasting by mixture of experts 混合专家预测交通速度

2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC) Pub Date : 2011-11-18 DOI: 10.1109/ITSC.2011.6083118

Vladimir Coric, Zhuang Wang, S. Vucetic

{"title":"Traffic speed forecasting by mixture of experts","authors":"Vladimir Coric, Zhuang Wang, S. Vucetic","doi":"10.1109/ITSC.2011.6083118","DOIUrl":"https://doi.org/10.1109/ITSC.2011.6083118","url":null,"abstract":"Traffic speed is one of the most important quantities for travel information systems. Accurate speed forecasting can help in trip planning by allowing travelers to avoid the congested routes, either by choosing the alternative routes or by changing the departure time. It is also helpful for traffic monitoring, control, and planning. An important feature of traffic is that it consists of free flow and congested regimes, which have significantly different properties. Training a single traffic speed predictor for both regimes typically results in suboptimal accuracy. To address this problem, a mixture of experts algorithm which consists of two regime-specific linear predictors and a decision tree gating function was developed. A generalized expectation maximization algorithm was used to train the linear predictors and the decision tree. The proposed algorithm was evaluated on a 5-mile stretch of I35 highway in Minneapolis containing 10 single loop detector stations, with prediction horizons ranging from 5 minutes to one hour ahead. Experimental results showed that mixture of experts approach outperforms several popular benchmark approaches.","PeriodicalId":186596,"journal":{"name":"2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC)","volume":"186 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125840726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

An investigation of proportionally fair ramp metering 比例公平匝道计量的研究

2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC) Pub Date : 2011-11-18 DOI: 10.1109/ITSC.2011.6082812

R. Gibbens, F. Kelly

{"title":"An investigation of proportionally fair ramp metering","authors":"R. Gibbens, F. Kelly","doi":"10.1109/ITSC.2011.6082812","DOIUrl":"https://doi.org/10.1109/ITSC.2011.6082812","url":null,"abstract":"This paper concerns ramp metering which is one important approach to dealing with congestion on motorways. Congestion occurs when demand exceeds available resources and can significantly reduce the capacity of the motorway network at peak times. Reduced capacity results in additional delays, increased environmental pollution and hinders passenger safety. Congestion is observed to cause low but highly volatile speeds resulting in more uncertain journey times (referred to as flow breakdown or stop-and-go behaviour). Ramp metering is intended to control the entry of new flow in such a way as to maintain steady flow on the motorway and to avoid the loss of capacity associated with congestion. The rate of entry of flow is set according to the particular ramp metering strategy. Such strategies have been the subject of much attention in the transport literature. One of the key issues is the trade-off between efficiency and fair use of resources. This is a trade-off that has been considered extensively in the modelling and control of communication networks. This paper adds to recent work on a ramp metering strategy, proportionally fair metering, inspired by rate control mechanisms developed for the Internet. Specifically, we use simulation results to compare proportionally fair metering with a greedy strategy for a linear network with a series of entry points leading towards a single common destination for all the traffic, such as a radial route towards a city centre. Under our modelling assumptions, the greedy strategy is provably optimal for exogenously determined arrival streams of traffic, but it is unfair, in a certain precise sense, between different entry points and may well have perverse and suboptimal consequences if it influences traffic demand. We further consider a network with parallel roads where flows of traffic may have route choice according to the levels of queueing at the individual entry points.","PeriodicalId":186596,"journal":{"name":"2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125893958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Empirical evaluation of a unified Bayesian object and situation assessment approach for lane change assistance 统一贝叶斯目标与变道辅助态势评估方法的实证评价

2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC) Pub Date : 2011-11-18 DOI: 10.1109/ITSC.2011.6082870

R. Schubert, G. Wanielik

引用次数: 13

Development of a combined steering torque overlay and differential braking strategy for unintended lane departure avoidance 转向扭矩叠加与差动制动相结合的车道偏离避免策略研究

2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC) Pub Date : 2011-11-18 DOI: 10.1109/ITSC.2011.6082855

Junyung Lee, K. Yi

引用次数: 21

Multi-phase time series models for motorway flow forecasting 高速公路流预测的多相时间序列模型

2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC) Pub Date : 2011-11-18 DOI: 10.1109/ITSC.2011.6082839

M. Davarynejad, Yubin Wang, J. Vrancken, J. Berg

引用次数: 9

Dynamic path planning for coordinated motion of multiple mobile robots 多移动机器人协调运动的动态路径规划

2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC) Pub Date : 2011-11-18 DOI: 10.1109/ITSC.2011.6083047

M. Langerwisch, Bernardo Wagner

引用次数: 6

Extended occupation grids for non-rigid moving objects tracking 用于非刚性运动物体跟踪的扩展占用网格

2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC) Pub Date : 2011-11-18 DOI: 10.1109/ITSC.2011.6083097

Benjamin Lefaudeux, G. Gate, F. Nashashibi

{"title":"Extended occupation grids for non-rigid moving objects tracking","authors":"Benjamin Lefaudeux, G. Gate, F. Nashashibi","doi":"10.1109/ITSC.2011.6083097","DOIUrl":"https://doi.org/10.1109/ITSC.2011.6083097","url":null,"abstract":"We present an evolution of traditional occupancy grid algorithm, based on an extensive probabilistic calculus of the evolution of several variables on a cell neighbourhood. Occupancy, speed and classification are taken into account, the aim being to improve overall perception of an highly changing unstructured environment. Contrary to classical SLAM algorithms, no requisite is made on the amount of rigidity of the scene, and tracking do not rely on geometrical characteristics. We believe that this could have important applications in the automotive field, both from autonomous vehicle and driver assistance, in some areas difficult to address with current algorithms. This article begins with a general presentation of what we aim to do, along with considerations over traditional occupancy grids limits and their reasons. We will then present our proposition, and detail some of its key aspects, namely update rules and performance consequences. A second part will be more practical, and will begin with a brief presentation of the GPU implementation of the algorithm, before turning to sensor models and some results.","PeriodicalId":186596,"journal":{"name":"2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126970530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

SPECIALIST-RM — Integrated variable speed limit control and ramp metering based on shock wave theory 基于激波理论的综合可变限速控制和匝道计量

2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC) Pub Date : 2011-11-18 DOI: 10.1109/ITSC.2011.6083116

I. Schelling, A. Hegyi, S. Hoogendoorn

{"title":"SPECIALIST-RM — Integrated variable speed limit control and ramp metering based on shock wave theory","authors":"I. Schelling, A. Hegyi, S. Hoogendoorn","doi":"10.1109/ITSC.2011.6083116","DOIUrl":"https://doi.org/10.1109/ITSC.2011.6083116","url":null,"abstract":"Both from theory and from practice it is known that the variable speed limit algorithm SPECIALIST can resolve moving jams on freeways. However, the algorithm does not take on-ramps into account in its current form, while on-ramp traffic may have an impact of the effectiveness of the algorithm. In this paper we extend the theory of SPECIALIST to include on-ramps and ramp metering. The theory of SPECIALIST is formulated in the framework of shock wave theory and it results in a control scheme that describes the propagation of the fronts (boundaries) between the various traffic states, and describes the time and location where the speed limits need to be active. Here we extend this with the traffic states describing the additional flow from an on-ramp (either metered or not), and develop the resulting control schemes. Since the location of the on-ramp relative to the moving jam and to the control scheme can be categorized into four cases, we develop four different control schemes. The developed control schemes can be used to analyze offline traffic data to assess the number of moving jams that can be resolved. Resolvability basically depends on (1) whether the traffic situation (speeds, flows, etc.) is such that a control scheme can be constructed, and (2) whether the control scheme physically fits on the freeway stretch equipped with variable speed limit displays. As an example, we analyze the data of a stretch on the A2 freeway in the Netherlands for various speed limit values and maximum on-ramp flows. The results show that for the number of resolvable moving jams the fact that the on-ramp flows are taken into account is more important than the metered value of the on-ramp flow.","PeriodicalId":186596,"journal":{"name":"2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133007917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14