Because it is so cheap to get around San Diego County on a Senior transit p ass ($18 for 30 days and parking is free at the transit station 3 miles awa y) I have been riding a lot of buses lately. To make constructive use of t he time, I have been closely observing how the drivers work their controls. That has led me to believe that one could design a device that would moni tor their movements and detect when they are distracted from their task by subtle change in their behaviors.
My idea, loosely sketched, is that the system could detect distraction with in 2 seconds (over 150 feet of travel at 60 MPH) and make some signal like a chirp or chime at a level just above ambient sound level, gradually incre asing in volume, that would cease when the system determines that the drive r has returned his attention to the road.
Now I am looking up current patents similar in nature.