Location

Stevenson, Washington

Date

12-7-2007

Session

Session 9 – Hybrid

Abstract

In forward collision avoidance systems, warnings may be provided more effectively if the underlying timing is set earlier than normal when the driver’s attention is not in the forward direction of the vehicle. In this regard, we determined the following driver characteristcs: (1) the amount of horizontal facial rotation needed to keep track of a moving object in the driver’s field of view increases significantly when the horizontal viewing angle of that target object exceeds 20 degrees, (2) when the driver’s face is oriented in the forward direction, the horizontal angle of facial rotation falls within 15 degrees, and (3) the reaction time to warning lengthens in accordance with the increase in the horizontal viewing angle. In the context of forward collision warning systems, we have determined the difference in the distribution of the driver’s horizontal facial rotation angle, for cases when the driver’ attention was and was not directed to objects in the forward direction of the vehicle. Furthermore, we have measured the reaction time to warning when the driver’s face was not directed forward. Last, our findings were successfully applied to issue the onset timing of a forward collision warning system.

Rights

Copyright © 2007 the author(s)

DC Citation

Proceedings of the Fourth International Driving Symposium on Human Factors in Driver Assessment, Training and Vehicle Design, July 9-12, 2007, Stevenson, Washington. Iowa City, IA: Public Policy Center, University of Iowa, 2007: 473-480.

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Jul 12th, 12:00 AM

Estimation of Driver Inattention to Forward Objects Using Facial Direction with Application to Forward Collision Avoidance Systems

Stevenson, Washington

In forward collision avoidance systems, warnings may be provided more effectively if the underlying timing is set earlier than normal when the driver’s attention is not in the forward direction of the vehicle. In this regard, we determined the following driver characteristcs: (1) the amount of horizontal facial rotation needed to keep track of a moving object in the driver’s field of view increases significantly when the horizontal viewing angle of that target object exceeds 20 degrees, (2) when the driver’s face is oriented in the forward direction, the horizontal angle of facial rotation falls within 15 degrees, and (3) the reaction time to warning lengthens in accordance with the increase in the horizontal viewing angle. In the context of forward collision warning systems, we have determined the difference in the distribution of the driver’s horizontal facial rotation angle, for cases when the driver’ attention was and was not directed to objects in the forward direction of the vehicle. Furthermore, we have measured the reaction time to warning when the driver’s face was not directed forward. Last, our findings were successfully applied to issue the onset timing of a forward collision warning system.