Those of us who live in the city are surrounded by street lights, landscape lighting, billboards, interior and exterior commercial building lights and headlights. As I left for Austin at 5:45 this morning, it didn't seem particularly dark. But as I reached a rural stretch, suddenly the pre-dawn darkness enveloped me. It hadn't occurred to me that a significant part of my road trip would be governed by nighttime speed limits.
I realized that the sun rather than my city clock determines when morning begins for much of the commuting world.
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