Distance between vehicles on the same route (7)
I believe the answer is:
headway
(Other definitions for headway that I've seen before include "Ground" , "Progress or success in work" , "Advance" , "Progress, forward movement" , "make progress" .)
I believe the answer is:
headway
(Other definitions for headway that I've seen before include "Ground" , "Progress or success in work" , "Advance" , "Progress, forward movement" , "make progress" .)