Here's what I do. I tape a blank piece of paper across the windscreen (windshield in US?) and attach a pen to a special wire holder which in turn attaches to my hat. Then, if I have an idea whilst driving along, I can write it down by bending forward without taking my hands of the wheel.
XXX Roger How do you record your > ideas while driving? I don't have a radio in my truck and I get lots of > ideas but if I don't stop to write tehm down, most of them are gone by the > time I get to where I can stop and write. I hate to stop for every idea.I've > thought of using a small tape recorder.-Don Boyd

