Headway

abbrivio

(forward motion, or its rate)

altezza

(clearance beneath an object)

avanzamento

(progress toward a goal)

avvio

(forward motion, or its rate)

evoluzione

(progress toward a goal)

impulso

(forward motion, or its rate)

intervallo

(time or distance interval between the fronts of two vehicles)

luce

(clearance beneath an object)

progresso

(progress toward a goal)

spazio

(clearance beneath an object)