When driving trucks with smoke stacks pointed straight up and following in 3rd person camera, the exhaust smoke looks like it has dissipated but it just makes the entire screen dark and then when you "pass through" it the screen brightens up quick making it flash or flicker depending on how fast you are driving. it is eye straining at night or if playing in a dark room. My 3rd person FOV is usually 90-100 and this happens when zoomed out. I hope I explained this well enough...
I think the vsync is failing in those area due to more shadow and increased in trees population or there is a problem in some area who create that behavior.
The same problem is happening on the Kovd map at sundown and sunrise, otherwise i can be in the midle of the same area without any frame drop.