I love it. The flag clips came in exactly when I wanted to hear something at a higher frequency, widening the stereo range - a perfect part. Road drones are such a rich texture, and I liked how you changed the tone of the noise elements as you went along: from the road noise, to the garage wall fan, to the vent.
A couple of things jumped to mind, but they are just creative ideas to possibly play with - your piece is wonderful already. There seems to be almost a melody in the road drone track at times, kind of in the upper low end of it’s frequencies… I could hear taking that recording into another track and filtering to highlight it, adding it in as another part (while the unfiltered track still plays in place). I could also hear bringing in a bit of spacial processing to the orchestra drone as it goes along, just as a slight bit of interest. And depending on where I was listening between my speakers, I could hear a slight rhythmic modulation in the air vent sound at the end (could be a bit of trailing delay from the the flag clips track?) - it might be interesting to hear that come out more. Thank you for sharing this!