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The Highway-adoption system is superior because continuous effort is expected. After all, which company wishes an association with a less than perfectly clean road shoulder? Who would drink another piña colada ifcannot control the litter on the stretch linked to its name? It is ironic, however, that it is the people throwing the rubbish who would blame the benefactor for the roadside not being spotlessly clean.
I almost overlooked the differences in the heap. Compare the upper half of both heaps: smooth curve top, straight line bottom. Notice also the second improbable cut-out bottom left of bottom heap.