I’m driving to North Carolina from Columbus oh, on interstate 77, but the GPS show me a detour to 81, & 77 again, why?

771119

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75795

{"replyTo":"","text":"It's probably where I77 and I81 run together from Wytheville to Max Meadows for approximately ten miles.","replyToPid":0}

771903

{"replyTo":"","text":"There is a lot of construction on 77","replyToPid":0}

617698

{"replyTo":"","text":"Mine does it too. I have the RM 540. I have really not been impressed with it. It probably thinks it can cut a mile or two off the trip. ","replyToPid":0}

151645

{"replyTo":"","text":"Just follow the GPS, it’s right this time, you’ll understand ","replyToPid":0}