Investigations of cell phone use while driving in nc
This presentation is the property of its rightful owner.
Sponsored Links
1 / 34

Investigations of Cell Phone Use While Driving in NC PowerPoint PPT Presentation


  • 82 Views
  • Uploaded on
  • Presentation posted in: General

Investigations of Cell Phone Use While Driving in NC. Jane Stutts William Hunter Herman Huang. University of North Carolina Highway Safety Research Center. Project Tasks:. Statewide telephone survey of cell phone users and non-users.

Download Presentation

Investigations of Cell Phone Use While Driving in NC

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Investigations of cell phone use while driving in nc

Investigations of Cell Phone Use While Driving in NC

Jane Stutts

William Hunter

Herman Huang

University of North Carolina

Highway Safety Research Center


Project tasks

Project Tasks:

  • Statewide telephone survey of cell phone users and non-users.

  • Analysis of characteristics of cell phone-related motor vehicle crashes.

  • Supplemental data collection by NC State Highway Patrol.


Statewide telephone survey goals

Statewide Telephone Survey Goals

  • Obtain updated information on cell phone use and user characteristics.

  • Compare cell phone users to non-users.

  • Obtain opinions of users and non-users on issues of cell phone safety and regulation.

  • Obtain baseline measures for future comparisons.


Telephone survey conclusions

Telephone Survey Conclusions

  • 3 in 5 drivers have used a cell phone while driving.

  • Usage highest in 25-39 and 40-54 age groups, and does not differ by gender or race.

  • Average talk time decreases with age, and is higher for males than females.

  • 1 in 4 users have a hands-free device, but not all use it.


Survey conclusions cont

Survey Conclusions (cont.)

  • Users perceive talking on phones to be less distracting and less of a safety concern than non-users.

  • Users less likely to support legislation that would prohibit anything other than hand-held phone use.

  • Users less likely to support stricter penalties for cell phone drivers in crashes.


Identification and analysis of cell phone crashes

Identification and Analysis of Cell Phone Crashes

  • Computerized search of NC crash report narratives from January 1996 through August 2000

  • Search words: answer, carphone, cell, dial

  • Narratives read to determine their relevance

  • 452 cell phone crashes identified

    • 0.04% of all crashes (an underestimate)

    • Increased from 0.01% in 1996 to 0.15% in 2000


Sample narratives

Sample Narratives

  • Driver 1 bent down to answer car phone and ran into back of Veh. 2 which knocked Veh. 2 into rear of Veh. 3.

  • Driver 1 stated that he ran off the roadway while trying to reach for his cell phone.

  • (Not used) Driver 1 stated that she had just got out of the eye doctors office and her pupils were dialated and she ran the red light.


Data limitations

Data Limitations

  • Search terms may have missed some narratives.

  • Drivers may not admit they were using a cell phone.

  • Officers may not ask about cell phone use.

  • Extent of underreporting is not known.

  • Hand-held vs. hands-free is not known.


Crash severity for cell phone users vs non users

Crash Severity for Cell Phone Users vs. Non-users


Urban vs rural crashes for cell phone users vs non users

Urban vs. Rural Crashes for Cell Phone Users vs. Non-users


Gender of cell phone users vs non users in crashes

Gender of Cell Phone Users vs. Non-users in Crashes


Age of cell phone users vs non users in crashes

Age of Cell Phone Users vs. Non-users in Crashes


Time of day of cell phone vs non cell phone crashes

Time of Day of Cell Phone vs. Non Cell Phone Crashes


Road class for cell phone vs non cell phone crashes

Road Class for Cell Phone vs. Non Cell Phone Crashes


Vehicle type for cell phone users vs non users

Vehicle Type for Cell Phone Users vs. Non-users


Violations for crash involved cell phone users vs non users

Violations for Crash-involved Cell Phone Users vs. Non-users


Summary of findings

Summary of Findings

  • Cell phone crashes more likely to occur:

    • On local roads and in urban areas

    • During mid-day or early afternoon hours

  • Drivers involved in cell phone related crashes are more likely to be:

    • Ages 35-55

    • Male

    • Driving sport utility vehicles

    • Cited for failure to reduce speed or traffic signal violations


Special data collection by nc state highway patrol

Special Data Collection by NC State Highway Patrol

  • All 8 NC SHP districts participating

  • Two month data collection period, May 15 - July 14, 2002.


Supplemental data collection form

Supplemental Data Collection Form

“Complete this form for any crash where a cell phone was in use.”

  • What type of cell phone was the driver using? (hand-held, hand-held with headset, etc.)

  • What was the driver doing at the time of the crash? (talking, dialing, answering, etc.)

  • How important was the cell phone in causing the crash? (very, somewhat, not at all, uncertain)

  • How did you obtain information about cell phone use in this crash? (observed, driver volunteered, questioned driver, witness report, etc.)

  • Estimated 11.8% of cell phone crashes statewide reported by NC HP.

    1,475 projected crashes annually


Descriptive results

Descriptive Results

  • 29 cell phone crashes statewide over the 2-month data collection period

    • Only 1 hands-free phone

    • Predominantly occurred while talking on phone (9 crashes), followed by reaching for phone (5 crashes), dialing (4 crashes) and answering phone (3 crashes)

    • 86% very significant, 14% somewhat significant in causing crash

    • Information most often volunteered by driver, but officers also questioned driver.


Cell phone crash projections

Cell Phone Crash Projections

  • 29 cell phone crashes statewide over a 2-month period

    Translates to 174 crashes annually

  • But only 11.8% of cell phone crashes statewide reported by NC SHP.

    1,475 projected crashes annually


Investigations of cell phone use while driving in nc

Full report can be accessed at:

http://www.hsrc.unc.edu/

Thank You!


Survey methods

Survey Methods

  • Random digit dial household telephone survey.

  • Adults ages 18+, NC resident, valid driver’s license.

  • Targeted 500 users, 150 non-users.

  • At least 50 respondents in each of following age groups: 18-24, 25-39, 40-54, 55-69, 70+.

  • Descriptive tabulations and multivariate regression analysis using SAS.


Screener results

Screener Results

  • Residency, age, driver license checks, plus

    “Do you talk on a cell phone while driving?”

  • 1006 completions, 106 non-completions (90.5% of all contacts)

  • 550/1006 cell phone users (54.7%)


Percent using cell phone while driving by age

Percent Using Cell Phone While Driving by Age

Adjusted % using cell phone while driving: 58.8%


Age distribution of cell phone users vs non users

Age Distribution of Cell Phone Users vs. Non-users


Gender distribution of cell phone users vs non users

Gender Distribution of Cell Phone Users vs. Non-users


Vehicle type distribution of cell phone users vs non users

Vehicle Type Distribution of Cell Phone Users vs. Non-users


Cell phone use characteristics type of hands free system

Cell Phone Use Characteristics- Type of Hands Free System

Hands-free 28%

Headset 64%

Speaker phone 33%

Other 3%


Outgoing incoming calls per day by user age

Outgoing & Incoming Calls per Day by User Age


Outgoing incoming calls per day by user gender

Outgoing & Incoming Calls per Day by User Gender


Opinions on cell phone legislation percent who would vote to support

Opinions on Cell Phone Legislation(Percent who would vote to support)


  • Login