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Brake Transmission Shift Interlock

Learn about the Brake Transmission Shift Interlock (BTSI) system, its requirements, and effectiveness in preventing accidents. Explore the impact of pedal design and familiarity on driver behavior. Discover mitigation strategies and the role of Event Data Recorders (EDRs).

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Brake Transmission Shift Interlock

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  1. Brake Transmission Shift Interlock

  2. Definition and Effect • Requires driver to depress the brake to shift from “park” • Lower rates of sudden acceleration complaints • Aerostar: 16.6 vs.1.7 • Town Car: 15.0 vs. 4.1 • Thunderbird/Cougar: 17.3 vs. 2.9

  3. BTSI and Heavy Vehicles • Falls Township started from parked position, revving engine, no defects • Asbury Park started from parked position, revving engine, no defects • Newtown started from parked position, accelerated after releasing parking brake, no defects

  4. BTSI Requirements • Currently voluntary per 2006 agreement • Cameron Gulbransen Kids Transportation Safety Act of 2007 would not have prevented these accidents because it excludes heavy vehicles

  5. BTSI Summary • Falls Township, Asbury Park, and Newtown • BTSIs shown to reduce pedal misapplication in light vehicles • Current efforts do not apply to heavy vehicles • Accidents unlikely had vehicles been equipped with BTSIs

  6. Pedal Design and Familiarity

  7. Pedal Design • Inconclusive research on pedal design as a factor • NHTSA undertook, abandoned pedal standardization effort • Some pedal arrangements provide same feedback • Little research in heavy vehicles

  8. Familiarity • Rely on nonvisual information • Drivers develop habitual responses • Resorting to habits when under stress may mean error • Two accidents involve different pedal configurations

  9. Falls Township Pedals Accident bus pedals Usual bus pedals

  10. Nanuet Pedals Accident pedal configuration Usual bus configuration

  11. Mitigation and Event Data Recorders

  12. Mitigation • Positive separation (bollards) • Recommended for transit facilities in 1998 • New Orleans and Pennsbury School District • Loading/unloading at school can pose risk of injury

  13. Event Data Recorders • Bus crashworthiness investigation in 1999 • Reiterated in 2008 • Would provide specific factual information and evidence • Proposed reiteration and reclassification of 1999 recommendations

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