Exploring the Association between Traffic Safety and Geometric Design Consistency Based on Vehicle Speed Metrics

Wu, Kun Feng; Donnell, Eric T.; Himes, Scott; Sasidharan, Lekshmi

doi:10.1061/(asce)te.1943-5436.0000553

Cited by 29 publications

(9 citation statements)

References 27 publications

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“…In case of the weighting factor, its value is added for each type of accidents by categorizing accidents with human damage into death, serious, and slight injuries. Values for adding weight were death, serious injury, and slight injury = 28 : 3 : 1 [16].…”

Section: Evaluation Criteria Of Accident Severitymentioning

confidence: 99%

Development of a Safety Evaluation Model for Provincial Highway

Yuan

et al. 2014

Discrete Dynamics in Nature and Society

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Provincial highway safety is one of the most important issues in transportation. To evaluate or assess the safety performance of provincial highway, traffic crash analysis or traffic conflict analysis has been used for a long history. However, it is very difficult and time-consuming to obtain historical crash data or traffic conflict data. This study analyzes the provincial highways' accident data during 2006–2010, and the characteristics of provincial highway have been investigated; in addition the influencing elements are identified. A comprehensive approach is introduced to evaluate provincial highway safety performance and corresponding models are developed considering the accidents, geometrics, facilities, and traffic environment. The approach will also result in a safety index to indicate the safety performance level of the provincial highway. In this paper, the approach (called safety evaluation approach) is practically applied to evaluate the safety performance of some provincial highways in Hebei Province. Results from the real application indicate that the approach has good applicability and can be used by field safety engineers.

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Section: Evaluation Criteria Of Accident Severitymentioning

confidence: 99%

Development of a Safety Evaluation Model for Provincial Highway

Yuan

et al. 2014

Discrete Dynamics in Nature and Society

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“…Figure 6 illustrates the evaluation method on channelization. For highways, geometric design consistency can be evaluated by speed metrics as shown in Table 5 [42]. For channelization on urban roads, driving speed lower than on highways, so the criterion of speed difference was chosen as 10km/h (for specific stages of channelization) and 20% (between adjacent stages).…”

Section: Evaluation Methods On Channelizationmentioning

confidence: 99%

Using 3D Mobile Mapping to Evaluate Intersection Design Through Drivers’ Visual Perception

Bao

Chen

2019

IEEE Access

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At intersections, road features related to different maneuvers, such as left-turn, right-turn, and central channelization (i.e., guidelines and channelized islands), are widely used to decrease the traffic conflicts and improve the safety and mobility of traffic. However, there are several main problems related to channelization design at intersections, including poor recognizability, unreasonable entering speed, insufficient sight distance, and relatively low merging speed. To address these problems, this paper focused on developing a method to assess how to design intersection features by dividing the driving process through intersections into four stages: ''appearance of channelization,'' ''beginning of channelization,'' ''middle of channelization,'' and ''end of channelization.'' Drivers' visual lane models were established based on the Catmull-Rom spline to quantify visual road information perceived by drivers. Shape parameters and three characteristic regions were extracted from these models. The naturalistic driving experiments and 3D mobile mapping experiments were conducted at intersections with channelized islands or guidelines. Driving speed distributions in the four stages were found to obey normal distributions and could be calculated by shape parameters with Bayesian inference. Then, 3D mobile mapping was used as a substitute for extensive naturalistic driving experiments to obtain drivers' visual perception from all possible visual angles. An evaluation method on intersection design was built and used to identify which stage of channelization needs to be modified. This new method helps to enhance the safety and efficiency of intersections. INDEX TERMS 3D mobile mapping, intersection design, channelization, drivers' visual lane model, Bayesian inference.

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“…2) 85 maximum speed reduction (85 th percentile MSR between two following highway elements as experienced by the same vehicle or driver). Wu et al (2013) analysed the relationships between geometric design consistency and traffic safety on two case-study highways in central Pennsylvania, United States of America (U.S. 322 and PA 350). Design consistency was referred to as the difference between operating speed and design speed.…”

Section: Introductionmentioning

confidence: 99%

Countermeasures to Improve Road Alignment Consistency Of Undivided Rural Roads

Russo

Biancardo

2017

The Baltic Journal of Road and Bridge Engineering

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The research aims to assess the relationships between the crash rates and road consistency. Design consistency assessment is a tool employed by designers to improve road safety. The case study involved a rural two-lane two-way road in Southern Italy located on a flat terrain without spiral transition curves between tangent segments and circular curves. Road alignment consistency was examined in two steps: by adopting standards in force in Italy based on the design speed profile and by plotting operating speed profile to determine the area bounded by the speed profile and the average weighted speed, and the standard deviation of operating speeds for each geometric segment. Operating speed prediction model, which returns the 85th percentile of the speed distribution of the only cars under free flow conditions, right weather conditions, and lighting was adopted. A negative exponential function was performed to predict the global consistency of a road as a whole. Finally, a model for predicting the crash rate was calibrated, confirming an increase of design consistency when the crash rates decrease significantly. The consistency model represents a useful tool during the geometric design process or the evaluation process for two-lane rural highways.

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Exploring the Association between Traffic Safety and Geometric Design Consistency Based on Vehicle Speed Metrics

Cited by 29 publications

References 27 publications

Development of a Safety Evaluation Model for Provincial Highway

Development of a Safety Evaluation Model for Provincial Highway

Using 3D Mobile Mapping to Evaluate Intersection Design Through Drivers’ Visual Perception

Countermeasures to Improve Road Alignment Consistency Of Undivided Rural Roads

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