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Screenshot of a paragraph of a research paper. Content: Bus Arrival Detection and On-Time Performance Tracking. Bus stops are often demarcated by a sign, which serves both riders and drivers alike. We found that buses pulling up to a stop create a characteristic air front that causes the sign to fex and oscillate (Figure 14), much like a tuning fork. Smaller vehicles do not induce the same efect. Larger vehicles, such as trucks, can produce the same signal if they similarly decelerate to a stop next to the sign, though this event is less typical. However, at least in some cases, this signal could be useful to power live bus monitoring apps and perhaps track on-time performance.