4-11. Lesson 4 Practice Exercise Answer Key and Feedback, Continued
The time measured between individual vehicles or elements of a column
measured from head to head as they pass a given point. All other
responses are other time factors. Page 4-21.
If rate is unknown, covering R in Figure 4-3 leaves D/T. Therefore, R =
D/T. Page 4-21 through 4-22.