I've had the same experience. I once noticed that a section of local highway had been restriped so instead of it being just white dashes it had white dashes followed immediately by a brief black dash. This is a fairly light colored concrete highway that runs east-west.
I was curious about this new striping, emailed, and very quickly got an interesting and friendly response about how they are studying this new striping technique because it makes the lines more visible. Being light colored pavement, running east-west (facing sunrise/sunset), and in an area where it rains frequently (which changes the pavement color) this made a ton of sense.
I think that asking a technical question politely was a big help, but the folks who replied seemed more like talking with a fellow engineer who was excited to explain why they are doing what they are doing.
(I've had other similar experiences when asking questions about / suggesting light timing changes, etc.)