Time travel stories often use the "butterfly effect", and the "law of unintended consequences" is often used in magic stories and other fiction. Today I saw a real life case of it.

I was sitting patiently at a left turn intersection, and started to go when the arrow came on, but someone coming from the other direction clearly was not going to stop. I nearly got hit by him. Later, at lunch I saw why. The municipalities have been switching over to high-output LED lights on the traffic signals for a while now, and while they are brighter, use less electricity, and last longer than the old bulb style lamps, they don't generate much heat. So any traffic control facing into the prevailing wind is now much more likely to fill with snow and stay that way.

I don't know why that struck me as worth sharing but I found it interesting. I know I'll be more alert in the future!

Hugs
Carla