Tom Savini's remake of NOTLD was cool - Barbara was able to get away because the house attracted the zombie horde's attention and she ducked them. Eventually they will horde up and one zombie follows the direction of another one until they are distracted. You can walk away from them but eventually they will catch up to you as you fall asleep or stop to rest unless you lose them.
It's the overwhelming hordes that make the zombies dangerous. 2 or 3 can easily be dispatched as in Dawn of The Dead when they are clearing the mall...but eventually, they will always outnumber you. That's why it's so important to keep moving...never stay in one place for long.