What does headway refer to?

Headway refers to the progress made in a forward direction, typically in the context of movement or advancement. It is often used to describe the distance or interval between two objects moving in the same direction, particularly in transportation or scheduling scenarios, such as the distance between buses or trains. This term conveys the idea of making progress or moving ahead rather than reversing or remaining stationary. In this context, understanding that headway signifies a positive advancement helps clarify why "forward movement" is the correct interpretation.