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Signs for GARAGE
Meaning: A building or shed for housing a motor vehicle or vehicles.
Pronunciation (sign description): Dominant "3" hand (handshape), palm facing left if right-handed (orientation), under the non-dominant palm-down flat hand pointing rightward (location), the dominant hand moves forward under the non-dominant hand twice with short movements (movement).
Phrases
When a garage is detached...
Meaning: A parking structure whose exterior walls are surrounded by open space.
A classifier is involved in the phrase.
Written ASL
[Note: ASL writing is not an official standard. This sign language writing remains in a state of open space to allow room for experiment, evolution, and improvement.]

ASL digit written and contributed by Tommy Coates III in the ASLwrite community, 2017.
This digit looks like a CL-vehicle running over some surface. To avoid confusion, Stevie Gemmill Naeyaert demonstrates the CL-vehicle-running-over digits like this:

Deaf Culture and tidbits
Anecdote
"My hearing partner and I bought a house with detached garage in 2010. He put some fabric that covered the windows of the garage. I took off the fabric off one particular window where I could look through from the kitchen window. He put it back. I took it down. He later asked why. Because, it's my sound. It's the window that I could "hear" whether he's home or he's out. For him, it's probably just the ability to see his truck through the window but it cannot be seen in the nighttime. I had a secret 'visual sound' that he probably had never realized. There were two tiny glowing orange dots linked to the garage door that I could see in the complete dark at night time. If I couldn't see the glowing specks, his truck hid them. He's home. When I could see them, he is out with his truck." -- Handspeak.
This is one of some examples of how Deaf people perceive that are different from hearing people.