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Alfredo Garciagarcia - One of the best experts on this subject based on the ideXlab platform.
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new geometric design consistency model based on Operating Speed profiles for road safety evaluation
Accident Analysis & Prevention, 2013Co-Authors: Francisco Javier Camachotorregrosa, Ana Maria Perezzuriaga, Manuel J Campoyungria, Alfredo GarciagarciaAbstract:In order to reduce road fatalities as maximum as possible, this paper presents a new methodology to evaluate road safety in both design and redesign stages of two-lane rural highways. This methodology is based on the analysis of road geometric design consistency, a value which will be a surrogate measure of the safety level of the two-lane rural road segment. The consistency model presented in this paper is based on the consideration of continuous Operating Speed profiles. The models used for their construction have been obtained by using an innovative GPS-data collecting method, based on continuous Operating Speed profiles recorded from individual drivers. This new methodology allowed the researchers to observe the actual behavior of drivers and to develop more accurate Operating Speed models than those which are based on spot-Speed data collection. This means a more accurate approximation to the real phenomenon, and thus a better consistency measurement. Operating Speed profiles were built for 33 Spanish two-lane rural road segments, and several consistency measurements based on the global and local Operating Speed were checked. The final consistency model takes into account not only the global dispersion of the Operating Speed, but also some indexes that consider both local Speed decelerations and Speeds over posted Speeds. For the development of the consistency model, the crash frequency for all sites was considered, obtaining a model directly related to safety. This allows estimating the number of crashes of a road segment by means of the calculation of its geometric design consistency. Consequently, the present consistency evaluation method becomes an innovative tool that can be used as a surrogate measure to estimate road safety of a road segment. Language: en
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new geometric design consistency model based on Operating Speed profiles for road safety evaluation
Accident Analysis & Prevention, 2013Co-Authors: Francisco Javier Camachotorregrosa, Ana Maria Perezzuriaga, Manuel J Campoyungria, Alfredo GarciagarciaAbstract:To assist in the on-going effort to reduce road fatalities as much as possible, this paper presents a new methodology to evaluate road safety in both the design and redesign stages of two-lane rural highways. This methodology is based on the analysis of road geometric design consistency, a value which will be a surrogate measure of the safety level of the two-lane rural road segment. The consistency model presented in this paper is based on the consideration of continuous Operating Speed profiles. The models used for their construction were obtained by using an innovative GPS-data collection method that is based on continuous Operating Speed profiles recorded from individual drivers. This new methodology allowed the researchers to observe the actual behavior of drivers and to develop more accurate Operating Speed models than was previously possible with spot-Speed data collection, thereby enabling a more accurate approximation to the real phenomenon and thus a better consistency measurement. Operating Speed profiles were built for 33 Spanish two-lane rural road segments, and several consistency measurements based on the global and local Operating Speed were checked. The final consistency model takes into account not only the global dispersion of the Operating Speed, but also some indexes that consider both local Speed decelerations and Speeds over posted Speeds as well. For the development of the consistency model, the crash frequency for each study site was considered, which allowed estimating the number of crashes on a road segment by means of the calculation of its geometric design consistency. Consequently, the presented consistency evaluation method is a promising innovative tool that can be used as a surrogate measure to estimate the safety of a road segment.
Francisco Javier Camachotorregrosa - One of the best experts on this subject based on the ideXlab platform.
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new geometric design consistency model based on Operating Speed profiles for road safety evaluation
Accident Analysis & Prevention, 2013Co-Authors: Francisco Javier Camachotorregrosa, Ana Maria Perezzuriaga, Manuel J Campoyungria, Alfredo GarciagarciaAbstract:In order to reduce road fatalities as maximum as possible, this paper presents a new methodology to evaluate road safety in both design and redesign stages of two-lane rural highways. This methodology is based on the analysis of road geometric design consistency, a value which will be a surrogate measure of the safety level of the two-lane rural road segment. The consistency model presented in this paper is based on the consideration of continuous Operating Speed profiles. The models used for their construction have been obtained by using an innovative GPS-data collecting method, based on continuous Operating Speed profiles recorded from individual drivers. This new methodology allowed the researchers to observe the actual behavior of drivers and to develop more accurate Operating Speed models than those which are based on spot-Speed data collection. This means a more accurate approximation to the real phenomenon, and thus a better consistency measurement. Operating Speed profiles were built for 33 Spanish two-lane rural road segments, and several consistency measurements based on the global and local Operating Speed were checked. The final consistency model takes into account not only the global dispersion of the Operating Speed, but also some indexes that consider both local Speed decelerations and Speeds over posted Speeds. For the development of the consistency model, the crash frequency for all sites was considered, obtaining a model directly related to safety. This allows estimating the number of crashes of a road segment by means of the calculation of its geometric design consistency. Consequently, the present consistency evaluation method becomes an innovative tool that can be used as a surrogate measure to estimate road safety of a road segment. Language: en
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new geometric design consistency model based on Operating Speed profiles for road safety evaluation
Accident Analysis & Prevention, 2013Co-Authors: Francisco Javier Camachotorregrosa, Ana Maria Perezzuriaga, Manuel J Campoyungria, Alfredo GarciagarciaAbstract:To assist in the on-going effort to reduce road fatalities as much as possible, this paper presents a new methodology to evaluate road safety in both the design and redesign stages of two-lane rural highways. This methodology is based on the analysis of road geometric design consistency, a value which will be a surrogate measure of the safety level of the two-lane rural road segment. The consistency model presented in this paper is based on the consideration of continuous Operating Speed profiles. The models used for their construction were obtained by using an innovative GPS-data collection method that is based on continuous Operating Speed profiles recorded from individual drivers. This new methodology allowed the researchers to observe the actual behavior of drivers and to develop more accurate Operating Speed models than was previously possible with spot-Speed data collection, thereby enabling a more accurate approximation to the real phenomenon and thus a better consistency measurement. Operating Speed profiles were built for 33 Spanish two-lane rural road segments, and several consistency measurements based on the global and local Operating Speed were checked. The final consistency model takes into account not only the global dispersion of the Operating Speed, but also some indexes that consider both local Speed decelerations and Speeds over posted Speeds as well. For the development of the consistency model, the crash frequency for each study site was considered, which allowed estimating the number of crashes on a road segment by means of the calculation of its geometric design consistency. Consequently, the presented consistency evaluation method is a promising innovative tool that can be used as a surrogate measure to estimate the safety of a road segment.
Ana Maria Perezzuriaga - One of the best experts on this subject based on the ideXlab platform.
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new geometric design consistency model based on Operating Speed profiles for road safety evaluation
Accident Analysis & Prevention, 2013Co-Authors: Francisco Javier Camachotorregrosa, Ana Maria Perezzuriaga, Manuel J Campoyungria, Alfredo GarciagarciaAbstract:In order to reduce road fatalities as maximum as possible, this paper presents a new methodology to evaluate road safety in both design and redesign stages of two-lane rural highways. This methodology is based on the analysis of road geometric design consistency, a value which will be a surrogate measure of the safety level of the two-lane rural road segment. The consistency model presented in this paper is based on the consideration of continuous Operating Speed profiles. The models used for their construction have been obtained by using an innovative GPS-data collecting method, based on continuous Operating Speed profiles recorded from individual drivers. This new methodology allowed the researchers to observe the actual behavior of drivers and to develop more accurate Operating Speed models than those which are based on spot-Speed data collection. This means a more accurate approximation to the real phenomenon, and thus a better consistency measurement. Operating Speed profiles were built for 33 Spanish two-lane rural road segments, and several consistency measurements based on the global and local Operating Speed were checked. The final consistency model takes into account not only the global dispersion of the Operating Speed, but also some indexes that consider both local Speed decelerations and Speeds over posted Speeds. For the development of the consistency model, the crash frequency for all sites was considered, obtaining a model directly related to safety. This allows estimating the number of crashes of a road segment by means of the calculation of its geometric design consistency. Consequently, the present consistency evaluation method becomes an innovative tool that can be used as a surrogate measure to estimate road safety of a road segment. Language: en
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new geometric design consistency model based on Operating Speed profiles for road safety evaluation
Accident Analysis & Prevention, 2013Co-Authors: Francisco Javier Camachotorregrosa, Ana Maria Perezzuriaga, Manuel J Campoyungria, Alfredo GarciagarciaAbstract:To assist in the on-going effort to reduce road fatalities as much as possible, this paper presents a new methodology to evaluate road safety in both the design and redesign stages of two-lane rural highways. This methodology is based on the analysis of road geometric design consistency, a value which will be a surrogate measure of the safety level of the two-lane rural road segment. The consistency model presented in this paper is based on the consideration of continuous Operating Speed profiles. The models used for their construction were obtained by using an innovative GPS-data collection method that is based on continuous Operating Speed profiles recorded from individual drivers. This new methodology allowed the researchers to observe the actual behavior of drivers and to develop more accurate Operating Speed models than was previously possible with spot-Speed data collection, thereby enabling a more accurate approximation to the real phenomenon and thus a better consistency measurement. Operating Speed profiles were built for 33 Spanish two-lane rural road segments, and several consistency measurements based on the global and local Operating Speed were checked. The final consistency model takes into account not only the global dispersion of the Operating Speed, but also some indexes that consider both local Speed decelerations and Speeds over posted Speeds as well. For the development of the consistency model, the crash frequency for each study site was considered, which allowed estimating the number of crashes on a road segment by means of the calculation of its geometric design consistency. Consequently, the presented consistency evaluation method is a promising innovative tool that can be used as a surrogate measure to estimate the safety of a road segment.
Manuel J Campoyungria - One of the best experts on this subject based on the ideXlab platform.
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new geometric design consistency model based on Operating Speed profiles for road safety evaluation
Accident Analysis & Prevention, 2013Co-Authors: Francisco Javier Camachotorregrosa, Ana Maria Perezzuriaga, Manuel J Campoyungria, Alfredo GarciagarciaAbstract:In order to reduce road fatalities as maximum as possible, this paper presents a new methodology to evaluate road safety in both design and redesign stages of two-lane rural highways. This methodology is based on the analysis of road geometric design consistency, a value which will be a surrogate measure of the safety level of the two-lane rural road segment. The consistency model presented in this paper is based on the consideration of continuous Operating Speed profiles. The models used for their construction have been obtained by using an innovative GPS-data collecting method, based on continuous Operating Speed profiles recorded from individual drivers. This new methodology allowed the researchers to observe the actual behavior of drivers and to develop more accurate Operating Speed models than those which are based on spot-Speed data collection. This means a more accurate approximation to the real phenomenon, and thus a better consistency measurement. Operating Speed profiles were built for 33 Spanish two-lane rural road segments, and several consistency measurements based on the global and local Operating Speed were checked. The final consistency model takes into account not only the global dispersion of the Operating Speed, but also some indexes that consider both local Speed decelerations and Speeds over posted Speeds. For the development of the consistency model, the crash frequency for all sites was considered, obtaining a model directly related to safety. This allows estimating the number of crashes of a road segment by means of the calculation of its geometric design consistency. Consequently, the present consistency evaluation method becomes an innovative tool that can be used as a surrogate measure to estimate road safety of a road segment. Language: en
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new geometric design consistency model based on Operating Speed profiles for road safety evaluation
Accident Analysis & Prevention, 2013Co-Authors: Francisco Javier Camachotorregrosa, Ana Maria Perezzuriaga, Manuel J Campoyungria, Alfredo GarciagarciaAbstract:To assist in the on-going effort to reduce road fatalities as much as possible, this paper presents a new methodology to evaluate road safety in both the design and redesign stages of two-lane rural highways. This methodology is based on the analysis of road geometric design consistency, a value which will be a surrogate measure of the safety level of the two-lane rural road segment. The consistency model presented in this paper is based on the consideration of continuous Operating Speed profiles. The models used for their construction were obtained by using an innovative GPS-data collection method that is based on continuous Operating Speed profiles recorded from individual drivers. This new methodology allowed the researchers to observe the actual behavior of drivers and to develop more accurate Operating Speed models than was previously possible with spot-Speed data collection, thereby enabling a more accurate approximation to the real phenomenon and thus a better consistency measurement. Operating Speed profiles were built for 33 Spanish two-lane rural road segments, and several consistency measurements based on the global and local Operating Speed were checked. The final consistency model takes into account not only the global dispersion of the Operating Speed, but also some indexes that consider both local Speed decelerations and Speeds over posted Speeds as well. For the development of the consistency model, the crash frequency for each study site was considered, which allowed estimating the number of crashes on a road segment by means of the calculation of its geometric design consistency. Consequently, the presented consistency evaluation method is a promising innovative tool that can be used as a surrogate measure to estimate the safety of a road segment.
Alfredo García - One of the best experts on this subject based on the ideXlab platform.
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Experimental Determination Of The Inertial Operating Speed For Consistency And Segmentation Analysis
2015Co-Authors: Alfredo García, F Javier Camacho-torregrosa, Javier Marín-moralesAbstract:Several studies, such as design consistency evaluation and determination of road homogeneous segments are based on evaluating the Operating Speed variation along the road segment. Although Operating Speeds can be accurately estimated by means of Operating Speed models, in some cases their use is limited. One example is consistency evaluation, in which drivers’ expectancies cannot be connected to the Operating Speed itself. Conversely, expectancies should be more an average value along some distance before each station. The new inertial consistency model reflect the reality in a better way, since it merges the Operating Speed variations before each geometric feature. However, there is little knowledge about which distance should be used to estimate the average Operating Speed as the inertial Operating Speed. This paper presents an experimental way to accurately determine the best distance to consider in those studies. It is based on the behavior and perceptions provided by 28 volunteers that drove a rural road, 31 km long, using their own vehicles. The proposed integration distance of 750 m can be used for both consistency and homogeneous road segments analysis.
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Homogeneous Road Segment Identification Based On Inertial Operating Speed
2013Co-Authors: Alfredo García, David Llopis-castelló, Ana María Pérez-zuriaga, Francisco Javier Camacho-torregrosaAbstract:Geometric design consistency evaluation is an important tool for the road safety evaluation of a road alignment. This evaluation determines the grade of fitting between road behavior and drivers’ expectations. Therefore, road consistency and road safety are related: a high consistency level leads to lower crash rates. While local consistency models only focus on a road section, such as curves or tangent-to-curve transitions, global consistency models consider the whole road segment. They evaluate the dispersion of the road segment Operating Speed profile, assuming that highly variable Operating Speed profiles increase the probability of accident occurrence. The result of those methodologies varies depending on the selection of the road segment. They should be applied to homogeneous road segments. Some methodologies are already established for splitting the road into homogeneous segments, but they are only focused on some geometric or traffic related variables. A new performance-based methodology for determining road homogeneous segments is presented. It is based on a new variable: the inertial Operating Speed, defined as the 1,000 m moving average value of the Operating Speed. It is an indicator of the behavior of drivers during last 1,000 m, allowing its comparison with the local requirements and, therefore, allowing a road consistency evaluation. Identifying significant minimum points located along inertial Operating Speed profile allows determining homogeneous road segments, using those points as limits between segments.
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New Consistency Index Based on Inertial Operating Speed
Transportation Research Record, 2013Co-Authors: Alfredo García, David Llopis-castelló, Francisco Javier Camacho-torregrosa, Ana María Pérez-zuriagaAbstract:The occurrence of road crashes depends on several factors, with design consistency (i.e., conformance of highway geometry to drivers' expectations) being one of the most important. A new consistency model for evaluating the performance of tangent-to-curve transitions on two-lane rural roads was developed. This model was based on the inertial consistency index (ICI) defined for each transition. The ICI was calculated at the beginning point of the curve as the difference between the average Operating Speed on the previous 1-km road segment (inertial Operating Speed) and the actual Operating Speed at this point. For the calibration of the ICI and its thresholds, 88 road segments, which included 1,686 tangent-to-curve transitions, were studied. The relationship between those results and the crash rate associated with each transition was analyzed. The results showed that the higher the ICI was, the higher the crash rate; thus, the probability of accidents increased. Similar results were obtained from the study...
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modeling Operating Speed and deceleration on two lane rural roads with global positioning system data
Transportation Research Record, 2010Co-Authors: Ana Maria Perez Zuriaga, Alfredo García, Francisco Javier Camacho Torregrosa, Pierangelo DattomaAbstract:In the road design process, Speed variation along the road segment is an important issue to consider in adapting road geometry to drivers' expectations. To achieve this objective, Speed criteria are used to evaluate road consistency. Being able to estimate the Operating Speed in the design phase can lead to safer road alignment. With this objective, several researchers have developed Operating Speed models. Most of these models are based on collected spot Speed data. They assume constant Speed on curves and, therefore, deceleration that occurs entirely on the approach tangent. According to these assumptions, spot Speed data are collected at the center of the horizontal curve and at the midpoint of the preceding tangent to obtain Operating Speed models. This paper presents a new methodology based on the use of Global Positioning System devices that allow continuous collecting and processing of Speed data. With this new methodology, not only can new and more accurate Operating Speed models be developed, but...
