Our transit agency espouses a perplexing policy discouraging frontline workers from claiming accumulated sick leave. In order to safely transport hundreds of people each shift, I am expected to be studiously-attuned to the thousands of possible obstacles confronting me. It takes great concentration to see, plan for, and react to each dangerous circumstance. Most are predictable, which is a skill that is second-hat to most veterans. Newbies have yet to acquire those years of experience to not only see at a glance, but to predict in a split second what while likely happen while also knowing how to reactappropriately. When an operator is in pain, the mind tends to focus on the personal rather than the professional. This intensifies the possibility of a costly mistake, one I'm not willing to gamble upon.