Main road 21 (Hungary)

You can help expand this article with text translated from the corresponding article in Hungarian. Click [show] for important translation instructions. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Hungarian Wikipedia article at [[:hu:21-es főút (Magyarország)]]; see its history for attribution. You may also add the template {{Translated|hu|21-es főút (Magyarország)}} to the talk page. For more guidance, see Wikipedia:Translation.

Main road 21
21-es főút
Route information
Length	65 km (40 mi)
Major junctions
From	M3 near Hatvan
Major intersections	23 in Bátonyterenye 22, 211 in Salgótarján
To	Somoskőújfalu border with  Slovakia I/79
Location
Country	Hungary
Counties	Heves, Nógrád
Major cities	Hatvan, Lőrinci, Pásztó, Bátonyterenye, Salgótarján
Highway system
Roads in Hungary Highways Main roads Local roads

The Main road 21 is a south–north direction First class main road in the road in the valley of a Zagyva river, that connects the M3 motorway's Hatvan junction to the, facilitating access from the capital city of Hatvan to Salgótarján-Somoskőújfalu. The road is 65 km long.^[1]

The road, as well as all other main roads in Hungary, is managed and maintained by Magyar Közút, state owned company.