T-logo is dark because it's recessed and the position of the sun cast it into shade.
I drove 145 miles home from Fremont on Sunday in heavy rain - and autopilot never hiccuped once. I was surprised, since when driving loaner Model S, I typically have lost AP when rain/road dirt have occluded it from working properly. Kind of a 'what magic is this??' moment.
But it's a simple explanation. Those clever engineers at Tesla put the front-facing radar BEHIND the front bumper. It stays clean. And we can't see it.
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Would the license plate then go under the radar?