Speed Lines will create shape layer paths that follow your object along it’s motion path, even if it’s parented or using expressions. You have complete control over the stroke amount and styling. Plus, everything can be updated after the script has been run.
These effects will be available on the Shape Layer:
Speed Lines Length: How long the strokes extend from the starting point.
Speed Lines Offset: How far the lines are separated from the starting point.
Speed Lines Enable End: Locks the endpoint of the strokes.
Speed Lines End: Moves the endpoint when ‘Speed Lines Enable End’ is checked.