This is a a special section of a highway adapted for aircraft landing and take-off. In Polish such things are called "drogowy odcinek lotniskowy" or DOL. This is DOL Leszno / DOL Rydzyna, just southeast of the town of Leszno, northwest of the town of Rydzyna.
RWY 13/31, 2280 x 20 meters, at 94 meters above the sea level. Presently not used.