National Road 1B
Drumul Național 1B
Route information
Part of E577
Maintained by Compania Națională de Autostrăzi și Drumuri Naționale din România
Length	67 km (42 mi)
Major junctions
West end	Ploiești
East end	Buzău
Location
Country	Romania
Counties	Prahova, Buzău
Highway system
Roads in Romania Highways

DN1B (Romanian: Drumul Național 1B) is a national road in Romania which runs from Ploiești to Buzău via Mizil. The DN1B has recently been upgraded. On its first segment, from Ploiești to Valea Călugărească it runs through one of Romania's most important wine regions and the site of many inns (hanuri) and historical cellars, many of which were built in the 18th and 19th centuries. The DN1B is therefore known as Romania's "wine road".

The A7 motorway will serve as a safer and high-speed alternative to the DN1B when completed between Ploiești and Buzău, with Mizil being served through an exit from the motorway at Cireșanu.^[1]

v t e Main roads in Romania
Motorways	In service A0 A1 A2 A3 A4 A6 A7 A10 A11 Under construction A0 A1 A3 A7 A8 A11 A13 Planned A5 A9 A14
Expressways	In service DEx12 DEx16 Under construction DEx4 DEx6 DEx12
Main national roads	DN1 DN2 DN3 DN4 DN5 DN6 DN7 DNCB
Other national roads	DN1A DN1B DN10 DN21 DN28 DN67C DN68A DN7C DN73 DN73A