I-79 runs north south from top to bottom and ends just to the north of this interchange. US 20 runs east west from left to right.
One thing that is unusual about this interchange is the use of a U-turn to accomodate missing movements. There are no exit ramps from I-79 to US 20 east. So the get to US 20 east one must exit to US 20 west and use the u-turn to get to US 20 east. This looks to have been done because of space constraints.