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Maybe I could find the answer in the manual, but I'm guessing many here can give a better answer than what I might find there. On the navigation screen, what are the green lines surrounding the highway? Sometimes, the line is on only one side of the road. Also, sometimes the lines have arrows, and sometimes they don't - what is their significance? And(one more), sometimes the arrows are close together, and other times they are far apart - again, what is the significance? Thanks.