Benefit

Pedestrian Crash Avoidance/Mitigation Systems can reduce up to 24 percent of annual vehicle-pedestrian crashes where fatalities are involved.

Historical crash data supplemented with objective testing of production vehicle systems and previous literature/research estimates the safety benefits for pedestrian crash avoidance/mitigation systems.


April 2017


Summary Information

The Volpe National Transportation Systems Center (Volpe), in support of the National Highway Traffic Safety Administration (NHTSA), developed and exercised a methodology to estimate the potential safety benefits for production pedestrian crash avoidance/mitigation (PCAM) systems. PCAM systems are vehicle-based, forward-looking pedestrian detection systems that alert drivers of potential vehicle-pedestrian crashes and/or apply automatic emergency braking (AEB) to prevent potential vehicle-pedestrian crashes.

Methodology

The methodology utilized relied on target baseline crashes obtained from national crash databases, system performance data from characterization track tests, and basic kinematic computer simulation of vehicle-pedestrian conflicts. General Estimates System (GES) and Fatality Analysis Reporting Systems (FARS) crash databases from 2011 and 2012 were queried to identify and characterize vehicle-pedestrian crashes and to establish baseline crash information.

Three production PCAM systems were tested for warning and AEB capabilities, and were characterized by various testing conditions (i.e., vehicle parameters, pedestrian parameters, and environmental conditions). These conditions were correlated to the baseline crash information to obtain system effectiveness measures for the production PCAM systems. The PCAM systems were further defined by three different system logic implementations:
  1. AEB only systems,
  2. Warning + first braking response between AEB or driver, and
  3. Warning + best braking response between AEB and driver.

A Monte Carlo simulation model was used to estimate the crash probability of vehicle-pedestrian conflicts given specific initial conditions. The simulation model exercised general kinematic equations in conjunction with driver and system performance data to determine the probability of a crash and the resulting impact speeds given a crash. Kinematic equations were derived from previous research for two priority pre-crash scenarios
1) Vehicle going straight and pedestrian crossing the road
2) Vehicle going straight and pedestrian walking alongside the road with/or against traffic

The simulation reconstructed historical PCAM-addressable GES and FARS crashes and superimposes PCAM system and driver performance data to determine the outcome with PCAM intervention.

Findings

The analysis in this report estimates that the crash avoidance effectiveness of PCAM systems can reduce up to 5,000 annual vehicle-pedestrian crashes and 810 fatal vehicle-pedestrian crashes. These crashes account for 8 percent of crash population where light-vehicles strike a pedestrian in the first event and 24 percent of same crash types where fatalities were involved.
Potential Crash Avoidance Effectiveness and Safety Benefits for PCAM Systems, AEB Only

Scenario Crash
Avoidance
Effectiveness
GES
Crashes
Reduced
FARS
Crashes
Reduced
Costs
Reduced
($M)
Equivalent
Lives
Saved
176.4% 4,324 675 $ 6,857 750
285.9% 663 135 $ 1,380 151
Total System 77.6% 4,987 810 $ 8,237 901

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Source

Estimation of Potential Safety Benefits for Pedestrian Crash Avoidance/Mitigation Systems

Author: Yanagisawa, Mikio; Elizabeth D. Swanson; Philip Azeredo; and Wassim Najm

Published By: John A.Volpe National Transportation Systems Center U.S. Department of Transportation

Source Date: April 2017

Other Reference Number: DOT HS 812 400

URL: https://rosap.ntl.bts.gov/view/dot/12475

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Benefit ID: 2017-01179