The network of defined sections of motorways and expressways (hereinafter also referred to as "defined road sections"), which in accordance with the relevant provisions of Act No. 488/2013 Coll. on the motorway vignette and on amendments to certain acts, as amended (hereinafter also referred to as "Act No. 488/2013 Coll. z. on the motorway vignette as amended" or "the Act") may be used after payment of the motorway vignette, is marked with the relevant traffic signs and currently consists of approximately 622 km of motorways D1, D2, D3 and D4 and expressways R1, R2, R4 and R6.