What is the correct approach for turning left from a two-way road onto a four-lane highway?

The correct approach for turning left from a two-way road onto a four-lane highway is to position your vehicle with your left wheels close to the centerline of the two-way road before making the turn. This positioning helps ensure that you have a clear line of sight to the oncoming traffic while making your maneuver. Entering the passing lane of the four-lane highway allows you to merge safely into the appropriate lane once the turn is completed, as it provides you enough space to align your vehicle within the marked lanes.

Turning at a straight 90-degree angle can be dangerous as it may not allow for proper merging into the traffic flow; this could lead to misunderstandings and potential accidents if other drivers expect more of an arching motion typical of left turns. Using the right lane to complete the turn would not be appropriate either, as it could create confusion for other drivers and potentially result in collisions. Stopping at the intersection first can be unnecessary unless traffic rules require it, but it typically can hinder the flow of traffic behind you and may not be the safest approach when the traffic allows for a gradual turn.