I've wondered why it took us so long to catch on. We saw it and yet we didn't see it. Or rather we were trained not to see it. Conned, perhaps, into thinking that the real action was metropolitan and all this was just boring hinterland. It was a puzzling thing. The truth knocks on the door and you say, "Go away, I'm looking for the truth,'' and so it goes away. Puzzling.

But once we caught on, of course, nothing could keep us off these roads, weekends, evenings, vacations. We have become real secondary-road motorcycle buffs and found there are things you learn as you go.

We have learned how to spot the good ones on a map, for example. If the line wiggles, that's good. That means hills. If it appears to be the main route from a town to a city, that's bad. The best ones always connect nowhere with nowhere and have an alternate that gets you there quicker. If you are going northeast from a large town you never go straight out of town for any long distance. You go out and then start jogging north, then east, then north again, and soon you are on a secondary route that only the local people use.

The main skill is to keep from getting lost. Since the roads are used only by local people who know them by sight nobody complains if the junctions aren't posted. And often they aren't. When they are it's usually a small sign hiding unobtrusively in the weeds and that's all. County-road-sign makers seldom tell you twice. If you miss that sign in the weeds that's your problem, not theirs. Moreover, you discover that the highway maps are often inaccurate about county roads. And from time to time you find your "county road'' takes you onto a two-rutter and then a single rutter and then into a pasture and stops, or else it takes you into some farmer's backyard.

So we navigate mostly by dead reckoning, and deduction from what clues we find. I keep a compass in one pocket for overcast days when the sun doesn't show directions and have the map mounted in a special carrier on top of the gas tank where I can keep track of miles from the last junction and know what to look for. With those tools and a lack of pressure to "get somewhere'' it works out fine and we just about have America all to ourselves.