Method To Preprocess Observed Traffic Data for Consistency: Application of Fuzzy Optimization Concept

Kikuchi, Shinya; Miljković, Dragana

doi:10.3141/1679-10

Cited by 20 publications

(12 citation statements)

References 4 publications

(1 reference statement)

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“…After detected, invalid loop data can be either removed from the database, ore corrected by means of spatial or temporal regression or other methods proposed in literature (e.g. 12, 15,16).…”

Section: Discussionmentioning

confidence: 99%

“…In this research, the principle of flow conservation is used for the detection of inaccurate data. Previous research about this topic focused on the adjustment or correction of observed value to comply with the principle of conservation of vehicles (12,15,16). Kikuchi & Miljkovic (15) applied the concept of fuzzy optimization.…”

Section: Principle Of Conservation Of Vehiclesmentioning

confidence: 99%

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Detection of Invalid Loop Detector Data in Urban Areas

Weijermars

Berkum

2006

Transportation Research Record

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Urban traffic data can be used for other purposes besides actuated signal control. It is however important that the data is of sufficient quality. This paper discusses a procedure for the detection of invalid traffic data produced by single loop detectors at signalized intersections. Basic quality checks -based on minimum and maximum flow thresholdsare used for the detection of erroneous data, whilst quality checks based on the principle of conservation of vehicles are introduced for the detection of inaccurate data. In most cases, the principle of conservation of vehicles implies that flow measurements have to be consistent between upstream and monitoring detectors within one intersection.The basic quality checks are appropriate for the detection of erroneous data. Moreover, quality checks based on the principle of conservation of vehicles are a useful addition to basic quality checks, since they are appropriate for the detection of inaccurate traffic data that was not detected yet by the basic quality checks. However, since flows are inconsistent between upstream detectors mutually as well in some cases, it is not always clear whether the results of this quality check are reliable. These cases were analyzed further by means of field observations. Finally, since the designed control procedure detects more invalid data than the detector station itself it can be concluded that these macroscopic quality checks are a useful addition to the microscopic quality checks.

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Section: Discussionmentioning

confidence: 99%

Section: Principle Of Conservation Of Vehiclesmentioning

confidence: 99%

Detection of Invalid Loop Detector Data in Urban Areas

Weijermars

Berkum

2006

Transportation Research Record

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“…Thus, triangular or trapezoidal shapes describe well enough these approximations. Also, Kikuchi et al [20] proved that the size of the range does not have a significant effect on the final values. However, it has to be large enough to find a feasible set of solutions.…”

Section: Fuzzy Inference Enginementioning

confidence: 99%

“…The estimation of dwelling time of stations is critical for an acceptable railway timetable planning [2]. For instance, the maximum dwelling time fixes the minimum required separation or headway between trains and defines the maximum frequency and capacity of a line.…”

Section: Introductionmentioning

confidence: 99%

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A Fuzzy Logic-Based Approach for Estimation of Dwelling Times of Panama Metro Stations

Berbey-Alvarez

Merchan

Poyo

et al. 2015

Entropy

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Passenger flow modeling and station dwelling time estimation are significant elements for railway mass transit planning, but system operators usually have limited information to model the passenger flow. In this paper, an artificial-intelligence technique known as fuzzy logic is applied for the estimation of the elements of the origin-destination matrix and the dwelling time of stations in a railway transport system. The fuzzy inference engine used in the algorithm is based in the principle of maximum entropy. The approach considers passengers' preferences to assign a level of congestion in each car of the train in function of the properties of the station platforms. This approach is implemented to estimate the passenger flow and dwelling times of the recently opened Line 1 of the Panama Metro. The dwelling times obtained from the simulation are compared to real measurements to validate the approach.

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Adjustment boarding and alighting passengers on a bus transit line using qualitative information

Oña

Gómez

Mérida-Casermeiro

2014

Applied Mathematical Modelling

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a b s t r a c tObtaining data to use in an urban public transport operation planning and analysis is problematic, particularly in urban bus transit lines. In an urban environment and for bus services, most ticketing methods can be used to record passengers getting on board but not getting off, and current methods are unable to make a proper adjustment of boardings and alightings based on the available data unless they do alighting counts. This paper presents a method whereby counts are made at fewer stops and qualitative information on alightings and/or vehicle loads between consecutive stops is used to make the boarding and alighting adjustment as a previous step to obtain the real origin and destination (O/ D) of passengers allowing the O/D matrix calibration by using the loads between stops. Qualitative information can be obtained by the vehicle's driver or an on board observer, avoiding the necessity of counting many stops in planning period. The method is applied to a real bus transit line in Malaga (Spain) and to a set of 50 different bus transit lines with number of stops ranging from 10 to 75. The results show that the proposed method reduces the adjustment errors with regard to traditional methods, such as Least Square Method, even in the situation where no qualitative information is used. When qualitative data is used on alightings and loadings, the reduction of the average error is over 50%.

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Method To Preprocess Observed Traffic Data for Consistency: Application of Fuzzy Optimization Concept

Cited by 20 publications

References 4 publications

Detection of Invalid Loop Detector Data in Urban Areas

Detection of Invalid Loop Detector Data in Urban Areas

A Fuzzy Logic-Based Approach for Estimation of Dwelling Times of Panama Metro Stations

Adjustment boarding and alighting passengers on a bus transit line using qualitative information

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