I work in security (and drive for a living as well) and often need a tiny task light that won't take up one of my hands. It's like a clip-on reading lamp, but it has the option of a bright red LED so that it preserves your night vision! To buy it, click on the above photo (which will open an Amazon Associates link).
DISCLOSURE: If you buy this item or any item you may see in my blog, Amazon will give me a small commission for promoting this device. I'm buying one this weekend (Dec. 2-3, 2018) -- an awesome device!