How to Say "highways" in Spanish
The Spanish word for “highways” is “carreteras” — A2 level. This is a very common word in everyday Spanish.

Examples
Las carreteras en esta región son muy sinuosas.
The roads in this region are very windy.
Hay muchas carreteras que conectan Madrid con la costa.
There are many highways that connect Madrid with the coast.
Debemos tener cuidado en las carreteras cuando llueve.
We must be careful on the roads when it rains.
Making it Plural
Since 'carretera' ends in a vowel, you simply add an '-s' to talk about more than one. Because it's a feminine word, remember to use 'las' or 'unas' with it.
Road vs. Street
Mistake: “Using 'carreteras' to describe a small street inside a city.”
Correction: Use 'calles' for city streets. 'Carreteras' are for the big roads that connect one town to another.
Related Translations
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