In project management, these charts are a method of graphically presenting a time schedule for all types of longitudinal, linear construction projects such as pipeline construction, rail construction, bridge construction, tunnel construction, road construction and similar linear infrastructure projects.
Activities in time–distance diagrams are displayed both along a time axis and along a distance axis according to their relative linear position. This allows showing not only the location of the activity but also the direction of progress and the progress rate.
Activities can also be presented as geometrical shapes showing the occupation of the work site over time such that conflicting access can be detected visually.
The advantage of a time–distance diagram is that it nicely shows all visible activities along the construction site on a single diagram.