Hand signal: "You have a flat tire"
I lived it once a couple years back- a tire shredded. About three people pulled along side and gave me strange waves...I thought they were weird until the third person kicked in my logic and I pulled...
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I have done it several times by pulling along side, getting their attention, pointing down in the direction of the tire, and then with fingers and thumb separated made a motion of closing my fingers to my thumb as if squeezing something between them. Apparently it gets the point across as each time they pulled off so I could explain what I saw.
