"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
Yes, highway is a common noun.
Common
It is a proper noun, because it is the name of a specific thing.
proper
Proper noun
No, the noun highway is a common noun, a word for any highway anywhere.A proper noun is the name of a specific person, place, thing, or a title; for example:Theresa Burke, Highway Superintendent, Town of Red Hook, NYPan-American Highway (Prudhoe Bay, Alaska to Ushuaia, ArgentinaOld Highway Cafe, Ocotillo, CAFederal Highway Administration, US Department of Transportation, Washington, DC"No Highway in the Sky", 1951 movie with James Stewart and Marlene Dietrich
it's a common noun. a proper noun would be Spider-Man.
Pencil proper or common noun
Proper noun or common noun
The noun cassette is a common noun.
a common noun?