> In Texas, by contrast, few appear to be new and well maintained, while many look quite heavily used. That is pretty interesting. A few weeks ago, there was

> In Texas, by contrast, few appear to be new and well maintained, while many look quite heavily used. That is pretty interesting. A few weeks ago, there was a thread here on HN talking about the Port of Long Beach backlog and a comment mentioning the scarcity of trucks with the clean idle certification. At about the same time, I took a road trip along the Interstate - Illinois, Indiana, Ohio - and paid attention to the trucks. Somewhere around 90% of them had the "California Clean Idle" sticker on them - and none of them had California plates. Even on trucks with Ontario plates (you see a lot of Canadian trucks in the upper midwest). My best explanation is that the long-haul routes crisscrossing North America have all the newest, cleanest, most modern vehicles and once they reach a certain age they are sold into the places where they don't drive long distances anymore.