Yes, I do this too. It's like I go on autopilot, but I do seem to handle the driving okay in this mode, except for occasionally passing an exit, but I don't like it.
REMEMBER!! ! When missing an exit, don't freak out or try to back up. Just go down to the next exit. Yes, it's annoying, but it is easy and a lot safer than acting up in traffic, or trying to back up.
Like another poster said, I use music to help keep myself from zoning out. Sometimes I will hum along with the radio, and other times I will sing or hum along to a tune called up from memory. It does help some.
I don't get out much, so my car battery tends to drain due to lack of use. I only have a parking pad, so there is no outlet for a trickle charger and the solar charger I use is not really strong enough. A few months ago I took my car for a short drive on a nearby highway intending to go down one exit and then come home, just to help recharge the battery. I was distracted by a slow moving truck in the slow lane, and trying to decide whether to pass or not. I finally did pass it only to find I had just passed the exit. So okay, I would just go down to the next exit. I got down to #2 and found: ROAD CONSTRUCTION USE NEXT EXIT! So I had to go down to the third exit before I could turn around and come home, not for any kind of shopping trip or errand, but just to help charge up my battery. At least the scenery is nice.
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau