There is a specific kind of clear-headedness that only arrives somewhere around the second hour of a long drive, when the novelty has worn off, the radio has annoyed you into silence, and your hands are doing the driving without consulting you. The problem I'd been circling for a week at my desk untangled itself somewhere north of Birmingham, unprompted, while I wasn't thinking about it. I have stopped being surprised by this and started planning for it.
I had four hours of motorway ahead of me and a flask of coffee that was already lukewarm by the time I joined the M6. The flask is a habit I refuse to give up despite the coffee always being disappointing, because the ritual of pouring it at a services is worth more than the contents.
The podcast was a long-form interview, the sort that runs past two hours and earns every minute. I won't pretend I remember the specifics well enough to do it justice, but the shape of it has stayed with me: two people who clearly liked each other working through an idea slowly, allowing silences, doubling back when something didn't quite land. No segment timer, no urgency, no host steering it towards a clip that would do numbers. Just thinking out loud, which is the thing I keep coming back to podcasts for and so rarely get.
What struck me, somewhere around junction 30-something, was how much the format suited the medium. You cannot skim a podcast the way you skim an article. It moves at the speed it moves, and on a motorway, so do you. The two unhurriedness-es matched. I'd have abandoned the same conversation after ten minutes if it had been a transcript on a screen, because my eyes would have started hunting for the point. In the car there is nothing to hunt for and nowhere to skip to, so you just let it unfold, and it turns out a lot of good thinking lives in the bits you'd otherwise skip.
I got where I was going with the work problem solved, the coffee finished, and the vague resolution to do longer drives more often, which I will not keep. But the episode I'll go back to, and the realisation that I do my best thinking precisely when I've arranged for my conscious mind to be busy with something else. The motorway is just the most reliable way I've found to occupy it.