What is the proper procedure when entering a multi-lane highway or motorway (autopista) from an acceleration lane (carril de aceleración)?

1. Enter abruptly at low speed and force circulating highway traffic to brake
2. Accelerate to match the speed of highway traffic, signal with the turn indicator, and merge smoothly into an open gap without impeding circulating vehicles
3. Come to a full stop at the very beginning of the acceleration ramp and wait for an empty highway
4. Drive along the shoulder until reaching the next exit