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Traffic. It’s not terribly reliable on less frequented roads. It pulls data from many things (including google maps running on phones, etc) and one or two cars sitting at a stop light could cause that area to show red (heavy traffic) even when it was only a couple cars for a minute (at a red light).
It’a more reliable on more busy roads with a constant flow.
It had probably left by the time you got there. Not to worry--folks who have found the lines say they are harmless. But you should always wear a mask when you are near them. The red ones are a little more active than the orange ones.