Unintended Consequences in Litter Control?

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Canadian roadsides are spotless, at least they are in the Ontario area between Michigan and Toronto. I noticed just how clean they are when my vehicle developed an exhaust leak while driving there. My repair plan was to stop, pick up a can from the roadside, and strap it over the leak. It probably took a half an hour to find a single can. My passenger and I joked that in Detroit we would have found enough parts to build a second car in that time.