The concept of "a garage" is shown by using a "horizontal 3" hand shape to
depict a vehicle driving forward to a location under a roof.
If you use a single movement it will typically mean: "a car driving into a
garage" or "a car pulling-in under a carport."
To sign "garage" in general (as a noun) use a double movement.
GARAGE:





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Animation of GARAGE:

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Click here for yet another garage animation
(Apparently you have a garage
fetish.)
Notes:
Compare "garage" to "SUBWAY."
(The orientation and hand shape of the dominant hand is different.)
Also see:
"Classifier 3" (CL:3)
Notes: