santa monica, california, santa monica, california, vehicle intrusion into farmers’ market july...
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Santa Monica, California,Santa Monica, California,Vehicle Intrusion into Vehicle Intrusion into
Farmers’ MarketFarmers’ Market July 16, 2003July 16, 2003
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Courtesy: San Diego Union-Tribune / AP
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Santa Monica AccidentSanta Monica Accident
• 10 fatalities
• 63 minor to serious injuries
• Buick driver and Mercedes driver and passenger uninjured
• No problems with weather, fatigue, alcohol, or drug use by driver
• No mechanical problems with vehicle
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IssuesIssues
• Unintended acceleration
• Temporary traffic control measures
• Event data recorders
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Santa Monica, California, Farmers’ Market
Courtesy: San Diego Union-Tribune / AP
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Human Performance IssuesHuman Performance Issues
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Driver InformationDriver Information
• 86-year-old male
• Long-term resident of area
• Familiar with Farmers’ Market
• Owned vehicle for over 10 years
• Valid California license at time of accident
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Potential FactorsPotential Factors
• Driver’s age
• Driver’s known medical conditions
• Vehicle controls
• Unintended acceleration
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Driver’s AgeDriver’s Age
• 86 years old
• Physical and cognitive changes associated with age
• No evidence of cognitive deficits
• No in-depth interview with driver
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Known Medical ConditionsKnown Medical Conditions• Some impaired mobility but no link to
driving ability or accidents
• Postaccident diagnosis of a heart condition No reported loss of consciousness Driver aware of market and took action
• No illicit or prescription performance-impairing substances detected
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Vehicle ControlsVehicle Controls
• Horizontal separation of 2 inches between accelerator and brake; minimum of 2 inches recommended
• No defect investigations or recalls related to pedal placement
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2 inches (50.8 mm)
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Vehicle ControlsVehicle Controls
• Concern is dual activation
• Not supported by evidence No brake light illumination Significant acceleration and no retarding
force
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Unintended AccelerationUnintended Acceleration
• Vehicle accelerates suddenly for no apparent reason with seeming loss of braking
• No common mechanical defect
• Found to be driver-related
• Cognitive issue, not physical one
• Can happen to anyone
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Components of Unintended Acceleration
Components of Unintended Acceleration
• Inadvertent activation Usually meant to press brake Due to position, force, speed, and so forth
• Failure to detect the error Panic/hypervigilance Habitual response
• Driver is certain correct control activated; error magnifies, increasing stress
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Unintended Acceleration in This Accident
Unintended Acceleration in This Accident
• Mercedes violated Buick driver’s expectations
• Buick driver’s rapid, forceful movement to brake resulted in execution error
• Stress increased
• Did not detect he was on accelerator
• Resorted to habitual response
• Witnesses report racing and revving engine
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Highway IssuesHighway Issues
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Highway IssuesHighway Issues
• Temporary traffic control plan for Farmers’ Market
• Pedestrian protection in Farmers’ Market
• Guidance for temporary road closures
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Temporary Traffic ControlPlan
Temporary Traffic ControlPlan
• Developed in 1981
• Updated in 1986
• Did not conform to MUTCD, Caltrans Traffic Manual, or Santa Monica’s WATCH manual
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Type III Barricade
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Rigid Barrier SystemsRigid Barrier Systems
• Additional signs and Type III barricades would not have prevented accident
• Separating pedestrians from vehicular traffic is key
• Market operated on regular basis since 1981
• Rigid but removable barrier system possible
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BollardsBollardsThick, low vertical post to exclude or
divert motor vehicles
Santa Monica New Orleans
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MUTCD GuidanceMUTCD Guidance
• Guidance to protect pedestrians in temporary traffic control areas
• Work zone emphasis
• Applicability to other street closures
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Event Data Recorders
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1992 Buick LeSabre
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Additional Data from Event Data Recorder
Additional Data from Event Data Recorder
• Driver’s actions As he left the post office Regarding Mercedes collision While traversing market
• How the vehicle was brought to a stop
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Electronic Data RecordersElectronic Data Recorders
• Manufacturers installing
• No standards
• Vary among manufacturers
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NTSB EDR HistoryNTSB EDR History
• Issued six recommendations
• Hosted four forums on use of data recorders
• Participated in working groups to advance event data recording
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Current EDR Initiatives
• Society of Automotive Engineers 70 data elements Standard format for displaying data Addressing data collection
• Institute of Electrical and Electronics Engineers Standard for Motor Vehicle EDRs Fault codes
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NHTSA EDR Notice of Proposed Rulemaking
NHTSA EDR Notice of Proposed Rulemaking
• Aid in investigation of crashes and injuries
• Assist to better define and address safety problems
• Improve safety systems and standards
• No requirement for installation or use
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NHTSA EDR Notice of Proposed Rulemaking
NHTSA EDR Notice of Proposed Rulemaking
• Data elements
• Data format
• Survivability
• Publicly available to crash investigators
• Standard statement in owner’s manual
• Applicable to voluntarily installed EDRs
• No requirement for EDR installation
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EDR BenefitsEDR Benefits
• Prompt and impartial data
• Accurate data
• Improved vehicle design and occupant protection
• Emergency response and triage
• Vehicle and roadway design improvements