Because getting stuck in traffic is good for you. It's an opportunity to think, ponder, and reflect on all things, from the personal to the global, the mundane to the sublime. As Robert Pirsig wrote in Zen and the Art of Motorcycle Maintenance:
"Let's consider a reevaluation of the situation in which we assume that the stuckness now occurring, the zero of consciousness, isn't the worst of all possible situations, but the best possible situation you could be in. After all, it's exactly this stuckness that Zen Buddhists go to so much trouble to induce...."