Some vehicles also have more than one fanbelt. One drives some peripheral items, the other drives others.
The absolute best thing to do is simply pull over to the first safe spot and call your auto club. That’ll ensure that the engine doesn;t sustain damage from overheating and it’ll ensure that you don’t suddenly die in the middle off a busy lane…should, for example, you be operating on your battery alone…until it runs too low to fire the plugs anymore.