Nemzetközi szemle: Február
Kerékpáros és gyalogos adatgyűjtési kézikönyv – munkaanyag
Bicycle and Pedestrian Data Collection Manual – Draft
Szerző(k): Minge, E., Falero, C., Lindsey, G., Petesch, M.,
SRF Consulting Group Inc., University of Minnesota, USA
Terjedelem: 73 oldal
This manual presents bicycle and pedestrian data collection principles, sensor attributes and site selection criteria. This manual also incorporates research performed by the University of Minnesota on sensor performance and data analysis techniques for bicycle and pedestrian volume data. This manual is meant to provide guidance on the establishment of both permanent and short duration count locations throughout Minnesota. The intended audience for this manual includes state and local agencies, and private sector data collection practitioners that plan to collect bicycle and pedestrian data. This manual will be updated based on findings from ongoing research and is expected to be completed in 2016, at which time it will be issued in a final (non-draft) form.
A sebesülési és halálozási kockázat értékmeghatározási lehetőségei a közlekedési létesítmények értékelésében
Approaches to valuing injury and mortality risk in transport assessments
Szerző(k): Clough, P., Guria, J., Bealing, M.,
New Zealand Institute of Economic Research
Terjedelem: 78 oldal
This report describes a review of literature on approaches to valuing injury and mortality risk in transport assessments. It provides background on why injury and fatality risk need to be valued in transport risk, and how New Zealand has arrived at its current practices in using a value of statistical life (VOSL) in transport policy and project appraisals. It examines theoretical and empirical literature on the scope of valuations and what methods are used for application in both transport and other safety contexts, and the policy implications of the current state of methods. Drawing on the literature and some recent meta-analyses of values, this review makes recommendation on the updating of the current value and what additional information would be a priority for supplementing the basic VOSL.
A megelőző fenntartási beavatkozások legjobb gyakorlata és teljesítmény értékelése Virgínia burkolatain
Best Practices and Performance Assessment for Preventive Maintenance Treatments
for Virginia Pavements
Szerző(k): Izeppi, E.L., Morrison, A., Flintsch, G.W., McGhee, K.K.,
Virginia Tech Transportation Institute, USA
Terjedelem: 60 oldal
Preventive maintenance has the potential to improve network condition by retarding future pavement deterioration. This report outlines guidelines for implementing a preventive maintenance policy for bituminous pavements. Preventive maintenance treatments currently being used in Virginia include chip seal, slurry seal, microsurfacing, and thin hot mix asphalt overlays. Historical pavement condition data were obtained from the Virginia Department of Transportation’s Pavement Management System for these treatments, and treatment performance models were developed. A district-level treatment selection tool was developed to facilitate the district-level decision-making process. A prioritized list of pavement sections was generated, maximizing the cost-effectiveness of the selected treatments subject to budgetary constraints set by the Central Office. As a pilot implementation, the treatment selection tool was then run for each pavement classification in each district. The results of this pilot suggest that this selection tool has the potential to be a practical decision support tool.
Adaptív video alapú járműosztályozási technika forgalomszámláláshoz
Adaptive Video-based Vehicle Classification Technique for Monitoring Traffic
Szerző(k): Wei, H., Abrishami, H., Xiao, X., Karteek, A.,
University of Cincinnati, USA
Terjedelem: 66 oldal
This report presents a methodology for extracting two vehicle features, vehicle length and number of axles in order to classify the vehicles from video, based on Federal Highway Administration (FHWA)’s recommended vehicle classification scheme. There are two stages regarding this classification. The first stage is the general classification that basically classifies vehicles into 4 categories or bins based on the vehicle length (i.e., 4-Bin length-based vehicle classification). The second stage is the axle-based group classification that classifies vehicles in more detailed classes of vehicles such as car, van, buses, based on the number of axles. The Rapid Video-based Vehicle
Identification System (RVIS) model is developed based on image processing technique to enable identifying the number of vehicle axles. Also, it is capable of tackling group classification of vehicles that are defined by axles and vehicle length based on the FHWA’s vehicle classification scheme and standard lengths of 13 categorized vehicles. The RVIS model is tested with sample video data obtained on a segment of I-275 in the Cincinnati area, Ohio. The evaluation result shows a better 4-Bin length–based classification than the axle-based group classification. There may be two reasons. First, when a vehicle gets misclassified in 4-Bin classification, it will definitely be misclassified in axle-based group classification. The error of the 4-Bin classification will propagate to the axle-based group classification. Second, there may be some noises in the process of finding the tires and number of tires. The project result provides solid basis for integrating the RVIS that is particularly applicable to light traffic condition and the Vehicle Video-Capture Data Collector (VEVID), a semi-automatic tool to be particularly applicable to heavy traffic conditions, into a “hybrid” system in the future. Detailed framework and operation scheme for such an integration effort is provided in the project report.
A forgalmi folyam elmélet 50. évfordulójára rendezett ünnepi szimpózium anyaga
Celebrating 50 Years of Traffic Flow Theory – a Symposium
Szerző(k): Transportation Research Board, USA
Terjedelem: 510 oldal
The book contains presentations, posters and papers presented at the Symposium Celebrating 50 Years of Traffic Flow Theory held on August 11–13, 2014 in Portland, Oregon. Main topics and chapters are: Fundamental diagram, Traffic flow models, Traffic control, Freeway traffic analysis, Calibration. Empirical observations of traffic analysis, Network wide modeling and control. Keynote Speakers’ PowerPoint Presentations are: Reflections on 50 Years of the TRB Committee on Traffic Flow Theory and Characteristics, Exploring the Impact of Microscopic Features of Traffic on Macroscopic Patterns, Traffic Flow Theory in the Era of Autonomous Vehicles, Challenges in Pedestrian Flow Modeling, Trajectories in 3-D: Unifying Model Calibration and Network Performance Analysis.
Költséghatékony beavatkozás teljesítmény és beavatkozás választási modellek fejlesztése
Development of Cost Effective Treatment Performance and Treatment Selection Models
Szerző(k): Khattak, M.J., Baladi, G.Y.,
University of Louisiana, USA
Terjedelem: 503 oldal
Louisiana Department of Transportation and Development (DOTD) has spent substantial financial resources on various rehabilitation and maintenance treatments to minimize pavement distresses and improve pavement life. Such treatments include, but are not limited to, chip seal, crack seal, micro-surfacing, thin and thick overlays, and structural overlays. Unfortunately, DOTD has not conducted a full scale performance assessment and cost-effectiveness analysis of all the aforementioned treatments. A recent study completed by the Louisiana Transportation Research Center (LTRC) regarding the pavement management system (PMS) and performance modeling emphasized the importance of developing treatment performance and selection models. In this regards, the LTRC initiated a three-phase research study that addresses such needs by developing rigorous treatment performance and selection models that are specific to the mission and management strategies of DOTD. The following are the three phases. Phase I- Review and Project Selection, Phase II- Performance Modeling and Costs and Benefits of Treatments, Phase III- Model Integration and Training. This final report focuses on the results of Phase I and Phase II of the study. Phase I is related to review of district pavement treatment practices and project selection for the development of pavement treatment performance models. Phase II deals with the performance modeling and costs and benefits of treatments. The data obtained from the Phase I was used to develop cost-effective pavement treatment performance and treatment selection models during Phase II of this study. Trigger values for optimum timing of pavement treatments and an approach to use the performance models cost effectively were established. All these findings will be integrated in the software development and training for DOTD staff to be completed during Phase III of this study.
Aszfalt burkolatok “csak ösztönző” egyenetlenség előírásának értékelése
Assessment of an Incentive-Only Ride Specification for Asphalt Pavements
Szerző(k): Nair, H., McGhee, K.K, Habib, A., Shetty, S.,
Virginia Center for Transportation Innovation and Research, USA
Terjedelem: 47 oldal
Smoothness specifications are applied by almost all state transportation agencies, including the Virginia Department of Transportation (VDOT), to promote the overall quality and optimum ride quality of pavements. VDOT has a ride specification that provides a pay adjustment (either incentive or disincentive) depending on the smoothness of the final paved surface. VDOT’s ride specification also has a provision to waive the disincentive and apply the incentive part only to projects where project geometry, etc., is perceived to make it difficult for the contractor to achieve the desired ride. When applied, the waiver is intended to encourage the contractor to apply additional efforts to improve the ride for otherwise difficult projects. In late 2011, VDOT’s executive leadership formed an Asphalt Quality Task Force to identify and recommend specific achievable measures to improve the quality of the asphalt paving in Virginia. The task force agreed to consider the proposal to make an incentive-only provision the default for projects that would otherwise not qualify for the regular ride specification application. This study documented and critically reviewed the pilot application of the incentive-only provision for rideability on selected asphalt resurfacing schedules for VDOT’s 2013 construction season. Several lane-miles of control sites were compared with the “incentive-only” sites to determine if the prospects of added incentives led contractors to alter their paving procedures in pursuit of a higher quality ride. There was no statistically reliable distinction between the achieved quality of the incentive-only and control sites. Further,
it was found that the originally proposed incentive-only provisions did not provide any meaningful benefit to VDOT or contractors. The study developed a revised incentive-only specification and further recommended that the proposed provision be applied to a wider range of projects in VDOT’s 2015 construction season.
Utazási információs szolgáltatások részletes felhasználói követelményei és a meglévő csatornák hatékonysága
Detailed customer requirements of travel information services, and the effectiveness of current channels
Szerző(k): Chang, J., Jones, C., Mora, K., Rive, G., Beetham, J.,
Opus International Consultants Ltd, New Zealand
Terjedelem: 237 oldal
The purpose of this report was to build on Transport Agency research report 540 ‘Customers’ requirements of multimodal travel information systems’ to provide practical market and customer research on the delivery methods that customers would prefer and to identify which would have the greatest impact on improving the quality of customers’ travel experiences. This research was carried out between October 2014 and May 2015 in seven stages: Stage 1: Literature and best-practice review focusing on identifying best practice for travel information systems, and methods to measure the effectiveness and customer satisfaction of travel information content and channels. Stage 2: Baseline customer information needs (secondary analysis of data from RR 540) relating to New Zealanders’ current access and priority ranking of travel information needs. Stage 3: A review of traveller information in New Zealand, Stage 4: User-centred design workshops and in-depth interviews. Stage 5: User-intercept and online surveys. Stage 6: Development of an implementation plan. Stage 7: Dissemination of information. This report describes the above work and provides recommendations for future actions, which include: improvements to data quality, development and implementation of consistent standards and operating procedures, and ongoing monitoring.