The rumble strip did it. One second I was in my lane and the next there was that hard buzzing noise under the right side of the car and my hands were correcting before my head caught up. Nothing happened. No other car anywhere. But my heart was going and my mouth had gone dry, and I had been arguing with myself for a solid hour about whether I was tired enough to stop.
The argument was over. I took the next exit, which had one gas station and a closed feed store, and I sat in that lot for twenty five minutes with the window down before I went anywhere.
The tells that come first
The rumble strip is not the warning. It is the thing the warnings were about. By the time I drifted, my body had been sending signals for at least an hour and I had been overruling all of them.
Here is what my own list looks like, roughly in the order it shows up. I start adjusting things for no reason: seat, mirror, vent, volume, seat again. Then I stop reading signs, meaning my eyes pass over an exit sign and nothing registers, and I have to look at the next one to find out where I am. Then I get the heavy face feeling, which for me is right around the eyes and cheekbones, like the whole front of my head is pulling down.
Then, and this is the one I trust most, I lose time. Not much. A mile, two miles. I look at the odometer or a mile marker and the number is further along than my memory of the last few minutes accounts for. That is the real signal. Everything after that is borrowed.
The lie I tell myself at four in the afternoon
My worst hour is not late at night. It is the middle of the afternoon, and the lie has a specific shape: I am not tired, I am just bored. This stretch is dull. Once the road gets interesting I will perk up.
I have caught myself saying that out loud in an empty car. And it is a good lie because it contains something true. Monotony does make me duller. But the fix for boredom and the fix for fatigue are not the same fix, and when I am wrong about which one I have, I keep driving on the assumption that the road will solve it for me.
The related lie is distance based. It goes, I only have an hour left. That one is worse, because it turns stopping into a waste. An hour of driving while impaired to save an hour of stopping is a terrible trade, but it does not feel like a trade in the moment. It feels like almost being done.
What I actually do when I catch one
The rule I hold myself to is that the tell is the decision. I do not get to evaluate the tell. If I have lost time, or if I have caught myself drifting even slightly within a lane, I am stopping at the next reasonable place, and reasonable means lit, legal, and populated enough that I feel fine being there.
What stopping means depends on how far in I am. If I caught it early, a real stop does it: out of the car, walk the length of the lot and back a couple of times, actual water, something to eat if I skipped lunch, which I often have. Fifteen minutes. That is enough when it is early.
If I caught it late, meaning there was a drift, then walking around does not cut it and I know it. That is a sleep. I find a legal, well lit place, I set an alarm, I put the seat back, and I take twenty or thirty minutes. I have never once regretted it. And if it is the end of a long day and there is a motel in that town, I stop for the night and eat the cost, because the cost is small and I have never been able to argue myself into thinking otherwise afterward.
Coffee is a bridge
I drink coffee on the road. I am not going to pretend otherwise. But I have had to get honest about what it does for me, which is buy a short window of feeling more alert without doing anything about the underlying tiredness.
So I use it as a bridge, not a fix. If I am forty minutes from where I am stopping for the night and I am flagging, coffee gets me to the stop. What it does not do is add two hours to a day that was already over. What happens is I feel fine for a while and then fall off a cliff, usually somewhere with no services, which is the worst possible place to run out.
The tricks people trade at rest areas are the same three every time: cold air, loud music, chewing something. They are useful for exactly one purpose, which is staying sharp enough to reach a place to stop. If I find myself deploying all three at once, that is not resourcefulness. That is my body telling me the driving portion of the day ended some time ago.
Night driving, and the rule I gave myself
I like driving at night. Less traffic, cooler air, and small towns look completely different when the only lit thing is a gas station canopy and a bar sign. I am not giving it up.
What I gave up is night driving at the end of a full day. Those are two different activities and I used to treat them as one. Starting at nine at night after an afternoon nap is a night drive. Rolling into the dark at nine at night because I left at seven in the morning is just a long day with worse visibility and fewer places to pull over.
So the rule is that darkness ends the day unless darkness was the plan. If I want a night drive, I sleep for it first. If I did not plan for one, sunset means I am looking for where I am stopping, and I start looking early enough to have options, because the difference between choosing a stop and needing one is about forty minutes and it matters more than anything else on this list.
Why I write any of this down
I keep a note on my phone with the tells, and I look at it at the start of a driving day. Not because I forget them. Because reading them in the morning, when I am rested, is a way of getting agreement from the version of me who is thinking clearly.
Tired me is a bad negotiator and an excellent rationalizer. She will produce three reasons to keep going in the time it takes to pass a mile marker. The only thing I have found that reliably beats her is a decision that was already made by someone with a clear head, written down where she can see it.