| Country: | ESP |
| Type: | Autovia |
| Route: | A-1 |
| Alternate Name: | Autovía del Norte |
| Map: | Autoviaesp a1.png |
| Length Km: | 371 |
| Terminus A: | Madrid |
| Terminus B: | Irun |
The A-1 (also informally known as Spanish; Castilian: Autovía del Norte; Basque: Iparraldeko Autobia) is a Spanish autovía route which starts in Madrid and ends in Irun. It replaced the former national road from Madrid to France, the N-1 road. It carries the designation of European route E05, and, as one of the major north-south arteries of Spain, is one of the country's busiest highways.
Between Burgos and Armiñón there is a toll alternative for this autovía, the autopista AP-1.
In 2011, work was ongoing to bring the section between Burgos and Madrid up to modern standards.
Autovía A-1 currently has two sections: one between Madrid and Burgos and another between Miranda de Ebro and Alsasua. Traffic through the 49.6 km discontinuity between Burgos and Miranda de Ebro is redirected to the N-I. Beyond Altsasu, traffic continues on the N-I to the French border.
| From | To | Length | Designation | ||
|---|---|---|---|---|---|
| 1 | 50.11 km | A-1 | |||
| 2 | A-1 | ||||
| 3 | 106.24 km | A-1 | |||
| 4 | 42.91 km | A-1 | |||
| 5 | 37.41 km | A-1 | |||
| 6 | 87.35 km | N-I | |||
| 7 | 27.16 km | N-I | |||
| 8 | 46.69 km | N-I, A-1[1] | |||
| 9 | 16.05 km | A-1 [2] | |||
| 10 | 45.94 km | N-I | |||
| 11 | 21.58 km | N-I |