What are the proper and general nouns in the following sentence?: We were driving though Pennsylvania when our truck almost hit a sign for Route 95.
Proper names are the nouns which describe a specific place or thing. The place is either only one (like Pennsylvania in this sentence) or not one but a speciffic one of many (there are many routes in USA, but the sentence says only about Route number 95).
The general nouns describe objects which are not speciffic. The word "truck" does not specify which (of many trucks) is described.
If you look at the sentence you will find that proper nouns are written with capital letters (in this case 'P' and 'R'), and general one are not.