The N-I was the former main road from Madrid to France in Spain

Spain

Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

.

The majority has now been replaced by the Autovía A-1 and Autopista AP-1. The road starts at Irun

Irun

Irun is a town of the Bidasoa-Txingudi region in the province of Gipuzkoa in the Basque Autonomous Community, Spain...

 then goes via Donostia , Tolosa

Tolosa, Spain

Tolosa is a town and municipality to the south of Donostia-San Sebastián in the Basque province of Gipuzkoa, Spain. It is located in a valley of the river Oria and overlooked by Uzturre, a white cross-topped mountain.-Famous people from Tolosa:...

, Beasain, Altsasu to Vitoria. It then runs parallel to the AP-1 to Miranda de Ebro

Miranda de Ebro

Miranda de Ebro is a city on the Ebro river in the province of Burgos in the autonomous community of Castile and León, Spain. It is located in the north-eastern part of the province, on the border with the province of Álava and the autonomous community of La Rioja...

 and Burgos

Burgos

Burgos is a city of northern Spain, historic capital of Castile. It is situated at the edge of the central plateau, with about 178,966 inhabitants in the city proper and another 20,000 in its suburbs. It is the capital of the province of Burgos, in the autonomous community of Castile and León...

where it was upgraded and becomes the A-1.