In Singapore's Punggol district, a quiet revolution in transportation is being stewarded not by engineers in laboratories, but by safety drivers who sit beside machines learning to navigate the world. Sarah Ahmad and Sherman Seng represent a new kind of human role — neither fully in control nor fully passive — that challenges our assumptions about what it means to work alongside artificial intelligence. Their vigilance, feedback, and judgment are quietly shaping the autonomous vehicles of tomorrow, even as the long-term fate of their profession remains an open question. In this liminal moment