I still call it Lebanon as well
My theory is that your more likely to get chigged where ever warm blooded animals walk.Primarily deer.So this is why they are often picked up in roads.Deer walk these same as we do.You need grass or something growing in the road for the chigs to climb.They climb and wait very patiently for the scent of carbon dioxide or whatever it is they smell us by and/or air currents which their very sensitive to.They feel the air move as you approach and then they reach out(I"ve seen grown ticks do this when I put my hand close to them) and grasp you as you pass by.So old roads and animal trails are high risk areas to get chigged.Boyd if your getting chigged in your driveway perhaps deer are walking it if you have a long drive through the woods say? Or if their eating plants growing in your yard.The chigs can drop off anywhere but where do animals spend much of their time? bedding area,feeding areas and travelling to and fro .We Frequent the same roads they do and thats why we get loaded on old roads full of chigger grass (I persist with chigger as well)