LumberJack: Intelligent Discovery and Analysis of Web User Traffic Composition

2003 ◽  
pp. 1-16 ◽  
Author(s):  
Ed H. Chi ◽  
Adam Rosien ◽  
Jeffrey Heer
Keyword(s):  
Traffic Composition

Traffic and speed characteristics on two-lane highways: field study

2003 ◽  
Vol 30 (6) ◽  
pp. 1042-1054 ◽  
Author(s):  
Yasser Hassan
Keyword(s):  
Light Condition ◽  
Operating Speed ◽  
Ambient Light ◽  
Horizontal Curve ◽  
Vehicle Class ◽  
Rural Highways ◽  
Horizontal Alignment ◽  
Heavy Truck ◽  
Traffic Composition ◽  
Rural Highway

Many models have been developed to evaluate the operating speeds on two-lane rural highways. However, provided information usually lacks details essential to assess their applicability at locations other than where they were developed. This paper presents a procedure to interpret raw data collected on three horizontal curve sites of different two-lane rural highway classes in Ontario. The speed observations were categorized into three vehicle classes (passenger car, light truck, and multi-axle heavy truck) and four light condition categories (day, night, and two transition periods). The minimum headway and percentile value to define the operating speed were examined, and a revision of the current practice deemed not warranted. The findings also indicated that operating speeds do not depend on the time or vehicle class. Finally, the horizontal alignment affects the operating speed, but the speeds of the two travel directions on a horizontal curve may differ even with little contribution of the vertical alignment.Key words: highway geometric design, operating speed, traffic composition, traffic counters, ambient light, acceleration, deceleration.

Detour-Impact Index Method and Traffic Gathering Algorithm for Assessing Alternative Paths of Disrupted Roads

2021 ◽  
pp. 036119812110312
Author(s):  
Alessandro Pucci ◽  
Mario Lucio Puppio ◽  
Hélder Silva Sousa ◽  
Linda Giresini ◽  
José Campos Matos ◽  
...  
Keyword(s):  
Rural Areas ◽  
Traffic Data ◽  
Index Method ◽  
The Road ◽  
Data Collection Process ◽  
Impact Index ◽  
Before And After ◽  
Information User ◽  
Traffic Composition ◽  
Operative Costs

Infrastructure plays a key role in society. Recent collapses of bridges have underlined their importance for road functionality, causing disruptions to commuters and emergency vehicles. Major issues arise on rural roads, where the lack of redundancy leads to the isolation of entire communities. Actual approaches to assess the resilience of countryside roads rely on the availability of specific datasets, limiting their practical application; this issue is typically related to traffic data. This research aims to propose innovative algorithms to assess the road network’s vulnerability in rural areas, including a novel traffic data collection process and its calibration. The aggregate metric is called Detour-Impact Index (DII) and compares user costs before and after a disruptive event. The method uses traditional network-impact metrics in combination with a new algorithm that allows us to gather quantitative traffic data starting from qualitative information. User travel time showed good agreement between the proposed procedure and traditional web-based methods. Furthermore, the paper provides user delay costs functions accounting for traffic composition, trip purposes, vehicle operative costs, nonlinear volume–capacity relation, and average daily traffic. A significant aspect is the adaptability of this framework, as it is designed to be coupled with existing approaches. The method is demonstrated on a case study in Tuscany (Italy).

Research on the Fatigue Design Load of Orthotropic Steel Box Girder for Long Span Suspension Bridge

2012 ◽  
Vol 178-181 ◽  
pp. 2365-2368
Author(s):  
Ce Chen ◽  
Bo Hai Ji
Keyword(s):  
Suspension Bridge ◽  
Load Spectrum ◽  
Fatigue Load ◽  
Box Girder ◽  
Traffic Loading ◽  
Long Span ◽  
Vehicle Load ◽  
Steel Box Girder ◽  
Traffic Composition ◽  
Matlab Programming

Traffic composition and the vehicle load were statistically analyzed and a fatigue vehicle load model was established according to the law of equivalent fatigue damage. Based on the MATLAB programming language and the Statistics Toolbox, vehicle fatigue load spectrum was simulated for accurately assessing actual fatigue stress of existing bridge under traffic loading. And the fatigue load could be used in the design for suspension bridge steel box girder.

Improving Railway Operational Efficiency with Moving Blocks, Train Fleeting, and Alternative Single-Track Configurations

2020 ◽  
Vol 2674 (2) ◽  
pp. 146-157 ◽  
Author(s):  
Adrian Diaz de Rivera ◽  
C. Tyler Dick ◽  
Leonel E. Evans
Keyword(s):  
Heterogeneous Traffic ◽  
Capital Investments ◽  
Single Track ◽  
Delay Performance ◽  
Train Control ◽  
Schedule Flexibility ◽  
Financial Consequences ◽  
Operating Strategies ◽  
Traffic Composition ◽  
Double Track

With installation of positive train control (PTC) on many U.S. rail corridors, Class I railroads may soon leverage these investments in communications network infrastructure to implement “advanced PTC” systems incorporating moving blocks. Train control with moving blocks can benefit operating strategies that dispatch fleets of multiple trains running at minimum headways. On single-track corridors with passing sidings long enough to hold multiple trains, fleeting may increase the efficiency of train meets, reduce train delay, and yield incremental capacity benefits. Alternative single-track configurations with fleet-length sidings at double the spacing of conventional single-train sidings can facilitate these operating strategies while minimizing additional track infrastructure and associated capital and maintenance costs. To investigate the operational synergies between moving blocks, fleeting, and longer but less frequent sidings, Rail Traffic Controller software is used to simulate and compare the delay performance of train operations on representative rail corridors for different combinations of fleeting strategy, train control system, siding configuration, and freight traffic composition. Operating fleets in conjunction with moving blocks produces the lowest overall train delay in specific cases of low schedule flexibility and heterogeneous traffic. With more efficient meets, moving blocks and/or fleeting primarily benefit low priority trains that typically wait for opposing traffic during train meets. Such incremental line capacity benefits have short-term financial consequences as they allow additional capital investments in double track to be deferred. Knowledge of train delay performance under moving blocks and fleeting will aid railway practitioners evaluating investments in advanced PTC systems and track infrastructure expansion.

scholarly journals Comparing Three Lane Merging Schemes for Short-Term Work Zones: A Simulation Study

2012 ◽  
Vol 2012 ◽  
pp. 1-18 ◽  
Author(s):  
Rami Harb ◽  
Essam Radwan ◽  
Vinayak V. Dixit
Keyword(s):  
Traffic Safety ◽  
Compliance Rate ◽  
Simulation Models ◽  
Work Zone ◽  
Highway Traffic ◽  
Work Zones ◽  
Short Term ◽  
Management Technology ◽  
Traffic Composition ◽  
Different Levels

Traffic safety and mobility of roadway work zones have been considered to be one of the major concerns in highway traffic safety and operations in Florida. Dynamic lane merging (DLM) systems—ITS-based lane management technology—were introduced by several states in an attempt to enhance both safety and mobility of roadway work zones. Two forms of lane merging, namely, the early merge and the late merge were designed to advise drivers on definite merging locations. Up to date, there are no studies that contrast both merging schemes under matching work zone settings. This study simulates a two-to-one work zone lane closure configuration under three different Maintenance of Traffic (MOT) plans in VISSIM. The first MOT is the conventional plans used in Florida’s work zones, the second MOT is a simplified dynamic early merging system (early SDLMS), and the third MOT is a simplified dynamic late merging systems (late SDLMSs). Field data was collected to calibrate and validate the simulation models. Simulation results indicated that overall, under different levels of drivers’ compliance rate and different percentages of trucks in the traffic composition, the early SLDMS outperformed the conventional MOT and the late SDLMS in terms of travel times and throughputs.

California Route 91 Toll Lanes Impacts and Other Observations

1998 ◽  
Vol 1649 (1) ◽  
pp. 55-62 ◽  
Author(s):  
Edward C. Sullivan ◽  
Joe el Harake
Keyword(s):  
Low Income ◽  
The United States ◽  
First Year ◽  
Toll Pricing ◽  
Wide Range ◽  
Toll Lanes ◽  
Traffic Composition ◽  
Operational Impacts ◽  
Near Future ◽  
Departments Of Transportation

The 16-km (10-mi) long California State Route 91 (SR-91) variable-toll lanes entered service December 27, 1995. This facility is the first practical application of congestion-based road pricing attempted in the United States. The California and U.S. Departments of Transportation sponsored a study to observe how travelers respond over time to variable-toll pricing and the other innovative features of this unique facility. Data covering a wide range of travel and transportation issues were obtained from mid-1994 through June 1997 and analyzed for lessons to inform public policies about future applications of congestion-based pricing. The principal findings are summarized. The SR-91 toll lanes are regarded as a success in terms of both commuter acceptance and favorable opinions. Although, as expected, first-year toll revenues did not cover total annualized costs, the facility operator anticipates profitability in the near future. Impacts on corridor traffic have been positive, and, despite changes in traffic composition, the overall level of ridesharing has not been adversely affected. Fears that peak congestion-based tolls might preclude benefits to low-income commuters have not materialized, although a relationship was found between frequency of toll lane use and income level. No adverse traffic operational impacts were observed. From experience with the SR-91 variable-toll lanes, further careful experimentation with congestion-based pricing in other settings appears warranted.

scholarly journals Results of Micro-Simulation Model for Exploring Drivers’ Behavior on Acceleration Lanes

2020 ◽  
pp. 1-10
Author(s):  
Giuseppe Cantisani
Keyword(s):  
Simulation Model ◽  
Mutual Influence ◽  
Design Guidelines ◽  
Traffic Model ◽  
Road Design ◽  
Micro Simulation ◽  
Traffic Stream ◽  
Traffic Volumes ◽  
Traffic Composition ◽  
Simulation Package

This study examines drivers’ behavior on acceleration lanes, close to the convergence between the main and the secondary traffic streams, by means of traffic micro-simulations. Experimental data collected videotaping two acceleration lanes in Italy have been used to initially calibrate a simulation model and to validate it subsequently. The analyses had focused on both vehicles coming from the on-ramp, in terms of entrance points dispersion into the main traffic stream along the acceleration lanes, merging speeds, and acceleration rates reached, and on vehicles driving on the freeway right lane, in terms of vehicles categories, traffic volumes, and speeds. The maneuvers have been implemented in the TransModeler traffic simulation package and several scenarios have been considered, changing the traffic composition and the speeds at which drivers enter the acceleration lane from time to time. This led to obtain a large number of case studies, where the mutual influence between the two flows combined with the vehicle performances and the psychophysical characteristics of drivers, have led to an initial evaluation of the main variables in respect of which the required length for the specialized lanes depends. Road design guidelines’ standards have been later compared to what was observed in reality and it can be claimed that the microscopic traffic model in some cases confirms the standards of road design guidelines while, in other cases, contradicts them.

scholarly journals THE INFLUENCE OF THE TRAFFIC COMPOSITION ON THE DEGREE OF ENVIRONMENTAL POLLUTION AND THE WAYS OF PREVENTION

2018 ◽  
pp. 18-21
Author(s):  
Giorgi Purtskhvanidze
Keyword(s):  
Environmental Pollution ◽  
Energy Sector ◽  
Toxic Compounds ◽  
Atmospheric Air ◽  
Motor Transport ◽  
Flow Intensity ◽  
Traffic Composition

Motor transport is an important part of the energy sector and represent one of the main sources of polluting the atmospheric air with toxic compounds. The work discusses the influence of traffic composition on the degree of environmental pollution and the ways of prevention. The perspective of implementing the “Green Street” in Kutaisi is considered based on the research of transportation flow intensity.

scholarly journals Impact of Road Traffic Tendency in Europe on Fatigue Assessment of Bridges

2020 ◽  
Vol 10 (4) ◽  
pp. 1389 ◽  
Author(s):  
Pietro Croce
Keyword(s):  
Fatigue Damage ◽  
Road Traffic ◽  
Heavy Vehicles ◽  
Fatigue Load ◽  
Fatigue Assessment ◽  
Load Models ◽  
Heavy Goods Vehicles ◽  
Traffic Composition ◽  
Real Traffic ◽  
Traffic Measurements

Fatigue load models for road bridges given in the Eurocode EN1991-2 have been calibrated considering real traffic measurements that became available around 1990. Since then, traffic composition has evolved considerably, also considering the issuing of the 96/53/EC Directive, which legitimated member states, on an equal and not discriminatory basis, to allow the circulation of Long and Heavy Vehicles (LHVs). Thus, the appropriateness of fatigue load models to cover also the effects of these vehicles, which are longer, heavier and potentially more damaging than common Heavy Goods Vehicles (HGVs), became an issue. The aim of the study is to assess how the evolution of European traffic influences the fatigue assessment of bridges. To capture the essence of the problem, three different real traffic measurements are compared in terms of fatigue damage: the Auxerre (FR) traffic, adopted to define fatigue load models in EN1991-2; the Moerdijk (NL) traffic, characterized by a high percentage of LHVs; and the Igualada (ES) traffic. To assess the current relevance of fatigue load models LM2 and LM4 of EN1991-2, the aptitude of these models to adequately reproduce the effects caused by LHVs is discussed in detail. The results demonstrate that the Auxerre traffic is still the most onerous; that the Moerdijk traffic is generally more severe than the Igualada traffic, and that the fatigue load models of Eurocode do not require major updates. The study is further supplemented by investigating the suitability of the formulae provided in the Eurocodes for the damage equivalence factors λ2 and λ3 to express the influence of the total lorry volume on the fatigue damage. In that latter case, the conclusion is that the formulae proposed in the Eurocodes, based on the assumption of a linear fatigue strength S–N curve with constant conventional slope m, could lead to erroneous, even unsafe, estimates of the fatigue life, especially when details are characterized by constant amplitude fatigue limit ΔσD, thus calling for further improvements of the formulae themselves.

Sign in / Sign up

Export Citation Format

Share Document