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Using Smartphones to Enable Situation Awareness on Highways

Using Smartphones to Enable Situation Awareness on Highways. Christian Manasseh May 3 , 2010. Experiment. Mobile phones were provided to 23 drivers: drivers were asked to drive for 6-10 weeks (2 weeks as baseline, last two weeks learning engine was turned on).

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Using Smartphones to Enable Situation Awareness on Highways

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  1. Using Smartphones to Enable Situation Awareness on Highways Christian Manasseh May 3, 2010

  2. Experiment • Mobile phones were provided to 23 drivers: • drivers were asked to drive for 6-10 weeks (2 weeks as baseline, last two weeks learning engine was turned on) Part I - Is there an effect on driver behavior due to the alert? Part II - Is this a lasting effect, or does it fade away with time?

  3. Data Analysis – Part I Two locations analyzed Data from 14 users 50 1sec-GPS traces

  4. Speed profiles with and without alerts vs. distance (Location 1) Alert Issued No Alert Issued (During base-weeks and non-base weeks)

  5. Speed profiles with and without alerts vs. distance (Location 1) Alert Issued No Alert Issued (During base-weeks and non-base weeks)

  6. Space-mean-speed plot for the two cases Alert Issued No Alert Issued (During base-weeks and non-base weeks)

  7. Data Analysis of the smoothness of traces at Location 1 A measurable difference in driver behavior due to the alert • STDEV of speeds for traces with no alerts: 16.45 +/- 3.07 mph (90% confidence) • STDEV of speeds for traces with alerts: 10.13 +/- 2.66 mph (90% confidence) • 38% smoother traces as a result of alerts • Worst case: 4.5% smoother traces

  8. Speed Profiles with and without Alerts (Location 1) Trace “without a dip” Trace “with a dip” Alert Issued No Alert Issued (During base-weeks and non-base weeks)

  9. Change in behavior due to alerts with time Percent of traces that have “dips” per week Weeks of Testing

  10. Conclusion • There is a measurable change in driver behavior due to a soft safety alert • STDEV of speeds for traces with no alerts: 16.45 +/- 3.07 mph (90% confidence) • STDEV of speeds for traces with alerts: 10.13 +/- 2.66 mph (90% confidence) • This change experiences a novelty effect in the first 3 weeks of using the system; the change persists after the first 3 weeks of testing

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