Which of the following is true about vehicles merging across multi-lane roadways?

Merging while making a right-hand turn is a permissible action under many traffic laws, particularly on multi-lane roadways. When a driver is making a right-hand turn, they can enter a new lane, taking care to yield to any vehicles already in that lane, but it does not require a signal to indicate this merging as a part of the turn itself. Instead, the right turn naturally involves entering another lane when safe to do so, allowing for a smooth and lawful transition.

In contrast to the other options, this choice aligns with standard driving practices that prioritize both safety and the flow of traffic. The requirements to yield to oncoming traffic are relevant when crossing lanes, but during a right turn, if the roadway is clear, the merging is typically allowed. Maintaining the same speed while merging would not be practical since speed adjustments are often necessary. Additionally, there are no mandatory signal requirements strictly for merging while making a right-hand turn, as the turn itself indicates the driver's intention.