In software engineering, the "Bus Factor" is the minimum number of team members that have to disappear (e.g., get hit by a bus) before a project stalls completely. If you are the only person who knows how the legacy code works, you are not an asset; you are a single point of failure. This book challenges the ego-driven desire to be indispensable. "Hit by a Bus" argues that true professional mastery is making yourself replaceable. It provides a framework for documentation, knowledge transfer, and mentorship that secures the company's future and frees the individual for promotion. The employee who hoards knowledge to protect their job is building a prison; the employee who shares knowledge is building a legacy. A guide for managers to identify "knowledge silos" and for employees to escape the trap of being the only one who can fix the printer.