From my observations, it was more about auto tire repairs. There were definitely zones with consistently high nail content, I paid for 3 tires in one year for m

From my observations, it was more about auto tire repairs. There were definitely zones with consistently high nail content, I paid for 3 tires in one year for my wife's trips to Watertown. Big roofing nails, good for auto tires. Over the course of the year, it seemed they were getting replenished.