Abstract
This paper presents the design and use of Copilot, a low-cost drowsy driver monitor. It consists of a digital camera integrated with a digital signal processor and is a small, easy-to-use version of a previous monitor used in research projects. The Copilot measures slow eyelid closures as represented by percent eyelid closure, defined as the proportion of time that a subject's eyes are closed over a specified period. The current driver interface is based on recent experimental results that drowsiness feedback can reduce drowsiness and improve driver performance. It consists of an audible tone associated with the readings of a visual gauge. Work is to continue to refine the driver interface.