Police conducted a high-risk traffic stop on Interstate 25 near Fort Collins on Monday night to pull over a truck in which a female passenger showed a “help” sign to passing vehicles, which turned out to be a prank, according to the Coloradoan. At 6:35 p.m., the young woman in the passenger seat of blue pickup truck hauling a U-Haul trailer with Wyoming license plates showed the sign to the person in the next lane.