I wasn't too sure where to post this so if there's a proper section 4 car trouble please move my post
Basically, When i drive my car (astra 2001) it makes a really loud constant squeaky/squealy noise. It's only started happening today, and i havent had anything done to the car to make it do this. When i turn the engine on it's normal and there's no noise, and when i rev the car when it's stationary it's also normal with no noise. It only happens when the car is moving, and driving above a certain speed. like at 5 mph its fine and doesn't squeal, it's just when i get to higher speeds above about 10mph this loud squealy noise occurs. It also squeals when im coasting in no gear as long as i'm above a certain speed. The car drives normal and seems fine and doesn't struggle.
Does anyone have any ideas where the noise could be coming from? And what it could be?