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Turn Signal Usage Rate Results: A Comprehensive Field Study of 12,000 Observed Turning Vehicles
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2012 by SAE International in United States
Annotation ability available
The turn signal is a vital safety feature that is not only required to be built in as standard equipment on all vehicles, but their use by the driver in everyday driving is required by law. Since not all drivers are diligent at properly actuating turn signals in every situation, the use of the turn signal is less than 100%. However, despite the fact that turn signals are a crash prevention feature, no known study relating to turn signal usage rates is available from the National Highway Traffic Safety Administration, nor from the Department of Transportation, nor from any University, nor from other private safety organizations.
This paper summarizes a first-ever published comprehensive study related to turn signal usage rates by everyday drivers and summarizes it in a simple, yet highly accurate naturalistic observation format with the following basic premise: A vehicle is observed to be turning in a situation that is deemed by the observer to require a turn signal: was the turn signal "on" or was it "off" in that observed vehicle? The summary of the cumulated data of turn signal usage is expressed in terms of a percentage usage rate. All turning drivers are unaware that their visible actions are data points in a study so the results are extremely accurate. Both turns as well as lane change usage rates are studied. Crash rates resulting from neglected turn signals are discussed, revealing that this neglect causes more crashes than distracted driving. The present turn signal system that relies solely on driver input can only be described as "defective". The paper also discusses how patented Electronic Intelligent Turn Signals with Turn Signal Assist would vastly improve usage rates and therefore significantly lower crash rates for no added vehicle cost.
CitationPonziani, R., "Turn Signal Usage Rate Results: A Comprehensive Field Study of 12,000 Observed Turning Vehicles," SAE Technical Paper 2012-01-0261, 2012, https://doi.org/10.4271/2012-01-0261.
- Ponziani, R., “Smart Turn Signal Technology - Advancing Crash Prevention and Combating Distracted Driving with Control Algorithm Enhancements,” SAE Technical Paper 2010-01-0744, 2010, doi:10.4271/2010-01-0744.
- Email from Lyn Cianflocco of the National Highway Traffic Safety Administration, National Center for Statistics & Analysis to Richard Ponziani of RLP Engineering, dated September 20, 2011
- Press Release from Response Insurance: “National Survey Reveals Why Drivers Don't Use Turn Signals”; March 15, 2006
- Ponziani, R., “Attaining 100% Turn Signal Usage Using Low Cost Automated Driver-in-the-Loop System,” SAE Technical Paper 2009-01-0551, 2009, doi:10.4271/2009-01-0551.
- NHTSA publication DOT HS 810 682 “Analysis of Fatal Motor Vehicle Traffic Crashes and Fatalities at Intersections, 1997 to 2004”; Subramanian, Rajesh and Lombardo, Louis; February, 2007
- NHTSA publication DOT HS 810 594 “The Impact of Driver Inattention On Near-Crash/Crash Risk: An Analysis Using the 100-Car Naturalistic Driving Study Data”; Klauer, S.G., Dingus, T. A., Neale, V. L., Sudweeks, J.D., and Ramsey, D.J.; April, 2006
- NHTSA publication DOT HS 811 052 “National Motor Vehicle Crash Causation Survey”; Singh, Santokh; December, 2008
- NHTSA publication DOT HS 810 846 “Analysis of Rear-End Crashes and Near-Crashes Analyses in the 100-Car Naturalistic Driving Study to Support Rear-Signaling Countermeasure Development”; Lee, Suzanne E.; Llaneras, Eddy; Klauer, Sheila; Sudweeks, Jerem; October 2007
- NHTSA publication DOT HS 811 366 “Crash Factors in Intersection Related Crashes - An On-Scene Perspective”; Choi, Eun-HaPh.D., a contractor employed by Bowhead Systems Management, Inc., working with the Mathematical Analysis Division; September, 2010
- Ohio Revised Code, Effective Date 09-21-2006 http://codes.ohio.gov/orc/4511.39
- NHTSA publication DOT HS 811 413 “Strategies to Increase Seat Belt Use: An Analysis of Levels of Fines and the Type of Law”; November, 2010
- NHTSA publication DOT HS 811 378 “Seat Belt Use in 2010 - Overall Results”; September 2010
- National Oceanic and Atmospheric Administration: “Odds of Becoming a Lightning Victim (Based on Averages for 2001-2010) http://www.lightningsafety.noaa.gov/medical.htm
- “Seventh Annual ‘Allstate America's Best Driver's Report ™’ Reveals Safest Driving Cities” press release; September 1, 2011 www.allstatenewsroom.com
- NHTSA press release DOT 174-10: “U.S. Transportation Secretary Ray LaHood Announces 2009 Distracted Driving Fatality and Injury Numbers Prior to National Distracted Driving Summit”; September 20, 2010 http://www.nhtsa.gov/PR/DOT-174-10
- NHTSA publication DOT HS 811 379 “Distracted Driving 2009”; September 2010
- United States Department of Transportation Fiscal Year 2012 Budget Highlights
- National Transportation Safety Board Special Investigation Report, “Vehicle and Infrastructure-based Technology For the Prevention of Rear-end Collisions”; NTSB Number SIR-01/01