A main road or highway, particularly used in Spanish-speaking countries to refer to trunk roads connecting major cities.
Spanish noun derived from 'carreta' (cart), using the suffix '-era' to indicate a place or means for something. It evolved from 'cart road' to 'highway'.
Spanish 'carretera' directly evolved from the word for cart—because highways literally started as the main routes carts took between towns, and the name preserved that origin.
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