Zhou Lei, a highway toll collector with years of experience, discovers that the truck tires of a familiar driver, Lao Wu, are in an abnormal state. Although the declaration procedures are complete, it conceals a major transport safety hazard. Zhou Lei decisively seals off the lane, enduring traffic congestion, public skepticism, and pressure from superiors, while also facing the driver's bribery attempts and sophistry. He pulls up surveillance footage and deduces layer by layer, ultimately forcing the driver to open the cargo box and exposing the risks of undeclared goods and missing securing measures. The relevant personnel are dealt with, and the hazard is defused. Zhou Lei steadfastly guards his post to uphold the safety bottom line and wins everyone's recognition.