The crossbars of the roof rack come with plastic end caps. But they don't fit snugly. I worry they might blow off somewhere. So, until I can find a good sticky glue that will remain sticky even after years of UV exposure, I'm leaving the caps off.
As a result, the crossbars act like large flutes. The wind blows across the open ends, producing low whistles that change in pitch and quality depending on speed and wind direction.
At times, the whistles sound like distant moans and murmurings. Voices of the spirits of the road and the wind, perhaps. Are they trying to tell me something important? Or are they just complaining.