main road
The Spanish term 'carretera principal' translates to 'main road' in English. This term is usually used to refer to significant roads, often in a town or city, which carry traffic from minor roads to the network of major roads or highways. Main roads are often characterized by multiple lanes, traffic lights, and they accommodate a large amount of vehicular traffic. Note, however, that in different places or contexts, 'carretera principal' might also be referred to as 'highway', 'main street', or 'primary road'.
The main road was completely empty after midnight.
This sentence describes a situation where the main road, a usually busy area, is devoid of vehicles or people during a specific time, which is after midnight.
I took the main road to avoid the rural roads.
In this example, the speaker indicates that they chose to travel via the main road, a typically larger and better-maintained route, in order to avoid smaller, possibly less well-maintained rural roads.
The store is on the main road, next to the bank.
This statement conveys the location of a store, stating it is on the main road and is situated next to a bank, implying it is in a frequented and possibly bustling area.