Get a flat tire fixed or get some air put in a tire. The universally understood signage of the tire placed at the curb. sometimes it's hung in a tree for better viewing. I got a flat on the way to Hoi An and had it fixed, two patches actually, and on my way in 10mins for $1 USD. Amazing how easy things work here. Back in the US it would have to be towed $50USD fixed $10USD and then picked up time wasted 2-5 hrs.