Small addition, these are comparing the loss of artistic details in the actual road (like the tire / driving lines and cracks and such) because of the intense normal maps or whatever is amping up the roughness of the surface too much and playing off the headlights to create all that noise.
Headlights off: https://imgur.com/knM8lEF.jpg
Headlights on: https://imgur.com/7CtPyFi.jpg
Headlights off: https://imgur.com/j7sC1Dr.jpg
Headlights on: https://imgur.com/kQE3fZG.jpg
You can actually see more detail and what the road surface is really like in the total darkness. Wild.
One more comparison too add for this nonsense. This time from Japan in the fall where there's leaves and debris on the edges of the roads.
Headlights Off: 
Headlights On:
Notice how when they're on, the visual noise from the lights shining at the surface map layered on the road manages to even drown out some of those additional details, along with the road textures themselves. It's that strong.
I wonder if it's just the some settings attached to vehicle headlights that could be tweaked to avoid or reduce this, or maybe it's the intensity of this moveable light itself along with the extremely low angle causing this behavior where the surface map strength needs to be adjusted to reduce the severity? Because this noise is really not noticeable with how it interacts from main skylight in certain times of the day, and not visible at all from just the overhead street lights at night which shine directly down from above when you turn the headlights off. Those lamps aren't nearly as "bright" and intense as the headlights, however.
