Calibrating Design Guidelines using Mental Workload and Reliability Analysis

The generic nature of road design is indiscriminate to age, race, or gender, as it is implicitly assumed that there are few behavioral differences between drivers while traversing various alignment elements (e.g., horizontal curves, tangential segments, etc.). For instance, the perception reaction time required, which is based on an 85th percentile value, on a tangent section is the same as that on a horizontal curve. This suggests that current guidelines do not consider the complexity that some geometric features might induce on drivers, and consequently, there is a need to address the many considerations of diversity. In this respect, human factors should be explicitly included in design guidelines. One aspect of human factors that has received little attention in the literature is related to the mental workload. In this study, a procedure is presented to estimate the mental workload for stopping sight distance. Then, reliability analysis is conducted to compare the change in the probability of non-compliance owing to the available sight distance and based on the mental workload. By analyzing data from 12 horizontal curves in Alberta, Canada, the probability of non-compliance dropped from 9.1% to 0.7%, and a moderate correlation with collisions was found. The results of the analysis showed that incorporating mental workload into the geometric design process can improve safety performance.

[1]  Paul A. Green,et al.  Cardiac Measures of Driver Workload during Simulated Driving with and without Visual Occlusion , 2003, Hum. Factors.

[2]  Francis P. D. Navin.  Reliability indices for road geometric design , 1992 .

[3]  Jonathan Dobres,et al.  The relative impact of smartwatch and smartphone use while driving on workload, attention, and driving performance. , 2019, Applied ergonomics.

[4]  SarhanMohamed,et al.  Reliability-based three-dimensional design of horizontal lateral clearance , 2011 .

[5]  Ingmar Ehrenpfordt,et al.  Workload of younger and elderly drivers in different infrastructural situations , 2014 .

[6]  Tarek Sayed,et al.  Risk-based framework for accommodating uncertainty in highway geometric design , 2009 .

[7]  Normand Teasdale,et al.  Mental workload when driving in a simulator: effects of age and driving complexity. , 2009, Accident; analysis and prevention.

[8]  Tarek Sayed,et al.  Multi-mode reliability-based design of horizontal curves. , 2016, Accident; analysis and prevention.

[9]  Kristie L Young,et al.  A simulator study of the effects of singing on driving performance. , 2013, Accident; analysis and prevention.

[10]  Yasser Hassan,et al.  Three-Dimensional, Probabilistic Highway Design , 2008 .

[11]  Myra Blanco,et al.  Driver Braking Performance to Surprise and Expected Events , 2010 .

[12]  Tarek Sayed,et al.  Sight Distance Standards Based on Observational Data Risk Evaluation of Passing , 2014 .

[13]  Tarek Sayed,et al.  Risk-optimal highway design: Methodology and case studies , 2012 .

[14]  Stephen Legg,et al.  The effect of cell phone type on drivers subjective workload during concurrent driving and conversing. , 2003, Accident; analysis and prevention.

[15]  Qiu Yun Mo,et al.  Research on the Effect of Alignments of Mountainous Highways on Driver Characteristics , 2014 .

[16]  Marc Green,et al.  "How Long Does It Take to Stop?" Methodological Analysis of Driver Perception-Brake Times , 2000 .

[17]  P A Hancock,et al.  Driver workload during differing driving maneuvers. , 1990, Accident; analysis and prevention.

[18]  Linda Steg,et al.  The influence of music on mental effort and driving performance. , 2012, Accident; analysis and prevention.

[19]  Gianfranco Forlani,et al.  Measuring driving workload of heavy vehicles at roundabouts , 2017 .

[20]  Yasser Hassan,et al.  Effect of Vertical Alignment on Driver Perception of Horizontal Curves , 2003 .

[21]  R.D.K. Shallam,et al.  Operating Speed Models on Horizontal Curves for Two-lane Highways , 2016 .

[22]  L Richl,et al.  Evaluating the Safety Risk of Narrow Medians Using Reliability Analysis , 2006 .

[23]  Eric T. Donnell,et al.  Safety performance functions for horizontal curves and tangents on two lane, two way rural roads. , 2018, Accident; analysis and prevention.

[24]  Eric T. Donnell,et al.  Stopping Sight Distance and Available Sight Distance: New Model and Reliability Analysis Comparison , 2017 .

[25]  Sherif Ishak,et al.  Effects of work zone configurations and traffic density on performance variables and subjective workload. , 2014, Accident; analysis and prevention.

[26]  Nicola Bongiorno,et al.  How is the Driver's Workload Influenced by the Road Environment? , 2017 .

[27]  Katsuya Matsunaga,et al.  Differences of drivers' reaction times according to age and mental workload. , 2008, Accident; analysis and prevention.

[28]  Praveen Edara,et al.  Vehicle Speed Characteristics and Alignment Design Consistency for Mountainous Roads , 2016 .

[29]  Joseph E. Hummer,et al.  Curve Collisions: Road and Collision Characteristics and Countermeasures , 2010 .

[30]  Suliman A. Gargoum,et al.  Feasibility of extracting highway vertical profiles from LiDAR data , 2018 .

[31]  Moshe E. Ben-Akiva,et al.  Probabilistic and Economic Factors in Highway Geometric Design , 1985, Transp. Sci..

[32]  Tarek Sayed,et al.  System reliability as a surrogate measure of safety for horizontal curves: methodology and case studies , 2020 .

[33]  Gianluca Dell’Acqua.  Modeling Driver Behavior by Using the Speed Environment for Two-Lane Rural Roads , 2015 .

[34]  Tarek Sayed,et al.  Calibrating Road Design Guides Using Risk-Based Reliability Analysis , 2013 .

[35]  S. Easa.  Reliability Approach to Intersection Sight Distance Design , 2000 .

[36]  Albert Kircher,et al.  Using mobile telephones: cognitive workload and attention resource allocation. , 2004, Accident; analysis and prevention.