How to Say "highway" in Spanish
The Spanish word for “highway” is “carretera” — A1 level. This is a very common word in everyday Spanish.

Examples
La carretera nacional está muy transitada hoy.
The national highway is very busy today.
Necesitamos un mapa para seguir la carretera hasta la costa.
We need a map to follow the road to the coast.
El viaje por carretera nos llevó dos días enteros.
The road trip took us two whole days.
Feminine Noun Rule
Since 'carretera' ends in '-a', it is a feminine word. Always use the feminine article 'la' or 'una' with it, and make any adjectives agree: 'la carretera ancha' (the wide road).
Road vs. Street
Mistake: “Using 'carretera' for small roads inside a city or town.”
Correction: Use 'calle' for streets within a city. 'Carretera' is usually the larger road connecting different towns or cities.
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