headway
head.way \-.wa-\ n 1a: motion or rate of motion in a forward direction 1b: ADVANCE, PROGRESS 2: clear space (as under an arch) 3: the time interval between two vehicles traveling in the same direction o n the same route
head.way \-.wa-\ n 1a: motion or rate of motion in a forward direction 1b: ADVANCE, PROGRESS 2: clear space (as under an arch) 3: the time interval between two vehicles traveling in the same direction o n the same route