Human Factors in Traffic Safety
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Transcript of Human Factors in Traffic Safety
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Human Factors inTraffic Safety
Fall 2015
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Important Resources• Evans, L. (2004) Traffic Safety. Science Serving Society. Bloomfield Hills, MI (see also Evans, L. (1991) Traffic Safety and the Driver. Van Nostrand Reinhold. New York, N.Y.)• Dewar, R.E., and P.L. Olson. (2007) Human
Factors in Traffic Safety. 2nd edition, Lawyers & Judges Publishing Company, Inc., Tucson, AZ. • Shinar, D. (2008) Traffic Safety and Human Behavior. Emerald Group Publishing Limited, Bingley, UK.
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Human-Environment-Vehicle System
Provide a conceptual framework to analyze motor vehicle collisions.Example: A 20-year old man with little driving experience, is taking an unfamiliar road on his way to an interview. His vehicle is not properly maintained. In fact, the tires are in poor shape. At some point on the trip, the rain starts to fall. Shortly thereafter he enters a horizontal curve with a radius below minimum standards, loses control of the vehicle and run off the road into a tree located within a few feet of the traveled way.Question: What are the contributing factors that have lead to this crash?
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Human-Environment-Vehicle System
System Component Event CircumstanceHuman Trip Young, inexperienced,
stressed
Vehicle Choice of vehicle Tires in poor conditionEnvironment Rain Wet and slippery surfaceEnvironment Curve Below standardHuman Steering maneuver OversteeringHuman Loss of control Unstabilized shoulderEnvironment Roadside conditions Tree too close traveled wayOutcome Impact (crash)
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57%
36%26%
6%
4%1% 2%
Crash Contributing Factors
Road Environment (34%)
Human Factors (93%)
Vehicle (13%)
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Haddon MatrixAgent Host Physical
Environment
Social Environme
ntPre-event
During the event
Post-event
William H. Haddon, Jr., came up with a Matrix to systematically analyze car crashes in a 1972 paper.
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Using the Haddon Matrix (based on Cassens 1992)
Agent e.g. car
Hoste.g.
driver
PhysicalEnvironme
nt
Social Environme
nt
Before theevent (crash)
Good brakes, car properly maintained
Good vision, alert
Well-designed roads and highways
Penalize drunk driving heavily
During the event
Airbags, anti-lock brakes
Motorcycle helmet, seatbelt
Non-rigidroadside poles, crash barriers
Mandate the use of safety glass in windows
After the event
Burn-resistant fabrics in car cabin
Emergency medical care
Effective emergency transport system
Support medical and rehabilitation services
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Risky Behavior and Road Accident Control
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Myth: “accident prone” individuals Safe and successful operation is influenced
by factors: physical, psychological and cognitive.
“Spare mental capacity” Human errors: rule based, knowledge
base, and skill based Drivers capable of adapting to driving
situations: strategic, tactical and operational
System Elements: The Road User
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Design of the vehicle: seats, easy ingress and egress, essential controls within reach
Vehicle is dynamic device (must be in accordance to driver expectancy)
Uniformity in operation of controls and displays (not always uniform from one vehicle to the next)
System Elements: The Vehicle
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Uniformity for highway design and traffic control devices
Provide proper navigational information System still not fully adequate Research still on-going for understanding
the relationship between road design (geometric, control devices, etc.) and safety.
System Elements: The Road
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Perception and Information Processing
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Stimulus applied to any sense organs For motor vehicles: visual is the most
important (also smell, auditory, tactile) Some important elements for driving task:
color, contrast sensitivity, eye movement depth perception, static visual acuity, etc.
Perception
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60o Visual Cone
10o DetectionEye
Fields of View
Peripheral vision
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Important for:◦ Passing vehicles on rural highways◦ Turning in front of oncoming vehicles◦ Accepting gaps◦ Vehicle control and path finding (on curves)◦ Vehicle operation during an emergency◦ Decision making
Perception of Speed
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Road Characteristics◦ Plays an important part in speed estimation
Vehicle size◦ Perception highly influenced by vehicle size
Speed adaptation◦ Underestimating actual speed after slowing
down from a typical highway speed (freeway exists)
Motion sensitivity◦ Perception taken from the forces acting on the
vehicle
Perception of Speed
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Judgment of Spacing
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Driver Perception and Response Time
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Stages of Perception-Response Time
Detection
Identification
Decision
Response
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Deduced Perception-Response Time
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Perception-Response Time by Geometric Design Elements
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Detection◦ Object conspicuity◦ Amount of information being processed by the
driver Identification
◦ Poor visibility: nighttime and fog◦ Speed and trajectory of the potential hazard
Factors Affecting PRT
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Decision◦ Choice: steering, braking (& accelerating?)◦ Choice may sometimes be more complex
Response◦ Usually minor component of PRT◦ Time allocated for foot leaving the accelerator
and hitting the brake pedal
Factors Affecting PRT
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Driver Expectancy◦ Predisposition on the part of drivers that
something will happen or be configured in a certain way
◦ Violation of expectancy will lead to longer PRT Night versus Day
◦ Many situations have the same PRT (see next figure)
◦ Detection may play a role in the difference
Factors Affecting PRT
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Night versus Day PRT
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Driver Fatigue◦ Difficult to measure, but increase in driver fatigue
will increase PRT Age and Gender
◦ PRT increases with age (0.44 sec for 20 years to 0.52 for 70 years of age)
◦ Female drivers have longer PRT than male drivers
Factors Affecting PRT
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Looking BehaviorChanging Lanes at
Intersections
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Location of Eye Fixations
Read all signs
Read only important signs
Did not read any signs
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Eye Fixation for Car Radios
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Eye Fixation for Car Mirrors
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Eye Fixation by Daylight Conditions
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Driver Performance
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Cognitive Phase
Associative Phase
Autonomous Phase
Acquisition of Driving Skills
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Eye Fixations of Novice Drivers
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Personality◦ Relationship between personality and crashes is
weak (i.e., personality changes with time, confounding variables)
◦ Some personality trait causing fatigue may lead to higher risk of crashes
Emotions◦ Emotional disturbances affect all aspect of our
life, including driving◦ Higher heart rate and blood pressure associated
with increase traffic flow
Individual Differences
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Mental Disorder and Fatal Crashes
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Stress◦ Stress can be caused by emotional (e.g., divorce),
cognitive (e.g., cut-off), and physiological (e.g., sick).
◦ Leads to aggression, confusion and risky behavior Motivation
◦ Car ownership important to people◦ Motivational elements: travel for necessity, social
status, freedom, self-expression ◦ Faulty motivation may lead to higher risk behavior◦ Marketing of motor vehicles
Individual Differences
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Risk Taking Behavior◦ Objective versus subjective risk◦ Sensation seeking (SS) individuals: relationship
not established SS and risky driving◦ Risk homeostasis theory
Social Factors◦ Drivers are influenced by other drivers “culture
of driving”◦ Drivers are also influenced by passengers
(family members versus teenagers)
Individual Differences
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Male and Female Drivers
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Male and Female Drivers
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Male and Female Drivers
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Differences by Age Group
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Driving Skills versus Crashes
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Driving Skills versus Crashes