This is more sheepocalypse than flock. Much more.
This scene is from Natales, Chile where one driver encountered more sheep in one go then you'll probably see in your life.
If sheep were in any way menacing, this would be terrifying. Thankfully though sheep only pose a threat to grass and plant life so this isn't the horror scenario it could be. Unless you own farmland, in which case this is your worst nightmare.