What is the purpose of acceleration lanes when joining a fast road?

En español: ¿Cuál es la finalidad de los carriles de aceleración al incorporarse a una vía rápida?

A To stop and wait for a gap
B To adapt speed to the traffic flow Correct answer
C To overtake vehicles on the main road
D To park temporarily

Why this is the correct answer

Acceleration lanes are used to adapt the vehicle's speed to the traffic flow before merging, never for stopping.

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