Answer:

INLOW

Answer	Crossword Clue
INLOW	Like some slow-moving vehicles
INLOW	Like some trucks going uphill
INLOW	About to shift to second, maybe

INLOW	Just starting to roll, perhaps
INLOW	Like a truck climbing a steep hill
INLOW	How cars go uphill
INLOW	How trucks go uphill
INLOW	Like a truck on a steep hill, maybe
INLOW	Like a big rig on a big hill, maybe
INLOW	How a trucker might go up a hill
INLOW	Like trucks going up or down a steep hill

INLOW	"Friends ... Places"
INLOW	Like a truck descending a steep hill