Quality of floating car data (FCD) as a surrogate measure for urban arterial speed

Commercial floating car data (FCD) is being increasingly used as a traffic data source due to its lower cost despite concerns about its reliability. This paper focuses on the evaluation of FCD speed quality as a surrogate measure for arterial speed from different aspects. First, FCD speed is compared to video-based traffic data, collected from a specific urban road segment and assumed as ground truth in (a) descriptive evaluations, (b) speed estimation, and (c) level of service estimation. Regression analysis carried out to derive transformation function between two datasets showed a nonlinear relation with a high correlation coefficient of 0.82. Working with data along an urban corridor of 3.6 km also showed that despite some outliers, FCD was capable of detecting peak-hour queue formations as well as incident related ones. Use of transformation function on FCD speeds helped to increase its potential in urban traffic monitoring.


Cost assessment of construction projects through neural networks
Gulcicek, Umit; Ozkan, Omer; Gunduz, Murat; DEMİR, İSMAİL HAKKI (Canadian Science Publishing, 2013-06-01)
Construction performance parameters have experienced greater international attention and discussion in recent years. In this study, the change in the load-bearing system cost of a reinforced concrete housing estate building was investigated in relation to the building importance factor, earthquake region, soil type, floor area, and the number of stories. Three different housing estate projects with seven and fifteen stories were investigated. The structural design calculations were performed according to fo...
Better estimation of origin-destination matrix using automated intersection movement count data
Tüydeş Yaman, Hediye; Sendil, Nuri (Canadian Science Publishing, 2015-07-01)
Intersection movements carry more disaggregate information about origin-destination (O-D) flows than link counts in a traffic network. In this paper, a mathematical formulation is presented for O-D matrix estimation using intersection counts, which is based on an existing linear programming model employing link counts. The proposed model estimates static O-D flows for uncongested networks assuming no a priori information on the O-D matrix. Both models were tested in two hypothetical networks previously used...
Quality control, homogeneity analysis, and trends of extreme precipitation indices in Northern Cyprus
Zaifoğlu, Hasan; Akıntuğ, Bertuğ; Yanmaz, Ali Melih (American Society of Civil Engineers (ASCE), 2017-12-01)
In this study, the annual and seasonal changes in extreme precipitation indices were investigated in Northern Cyprus by using the non-parametric Mann–Kendal trend test and Sen’s slope estimator. To this end, quality control of data procedure including estimation of missing data, detection of unreasonable values, and outliers were applied to 36 daily precipitation series to identify different errors. In order to test the homogeneity of the daily series, a two-step approach with four homogeneity tests and ove...
Assessment of overtopping reliability and benefits of a flood detention dam
Yanmaz, Ali Melih (Canadian Science Publishing, 2008-10-01)
There is a growing tendency to assess safety levels of existing dams and to design new dams using probabilistic approaches according to project characteristics and site-specific conditions. This study is a probabilistic assessment of the overtopping reliability of a dam, which will be designed for flood detention purpose, and will compute the benefits that can be gained as a result of the implementation of this dam. In a case study, a bivariate flood frequency analysis was carried out using a five-parameter...
Monitoring urban traffic from floating car data (fcd): using speed or a los-based state measure
Altıntaşı, Oruç; Tüydeş Yaman, Hediye; Tuncay, Kağan (Springer, Cham, 2019-01-01)
Floating Car Data (FCD) has an important traffic data source due to its lower cost and higher coverage despite its reliability problems. FCD obtained from GPS equipped vehicles can provide speed data for many segments in real-time, as provided by Be-Mobile for urban regions in Turkey. Though only providing speed per consecutive road segments, FCD is a great data source to visualize urban traffic state, in the absence of any other traffic data source, which is the focus of this study. After evaluation of var...
Citation Formats
O. Altintasi, H. Tüydeş Yaman, and K. Tuncay, “Quality of floating car data (FCD) as a surrogate measure for urban arterial speed,” CANADIAN JOURNAL OF CIVIL ENGINEERING, pp. 1187–1198, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47931.