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Road in Hungary
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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.
The road, as well as all other main roads in Hungary, is managed and maintained by Magyar Közút, state owned company.
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Main road 21
M3 near Hatvan
Slovakia 
I/79
