The first large section from Chinese Romanization: Pronunciation and Orthography to go online is the one on proper nouns (2 MB PDF).

1. Introduction
2. Place Names
3. Personal Names
   1. formal names
   2. non-formal names
   3. forms of address
4. Transliteration of Foreign Place Names and Personal Names
5. Other Proper Nouns
   1. names of nationalities
   2. names of religions and deities
   3. names of dynasties
   4. names of festivals and holidays
   5. names of celestial bodies
   6. names of languages
   7. titles of literary and artistic works
   8. titles of newspapers and magazines
   9. names of social units
   10. trademarks
6. Proper Nouns in Combination with Common Nouns

Thus, these rules cover many of the applications of Pinyin that appear on signage.

I’ll post a version with OCR later (probably weeks or months rather than days). In the meanwhile, you can use the bookmarks within the PDF file to navigate the document.

further reading:

• detailed rules for Hanyu Pinyin: a major addition to Pinyin.Info
• pinyin rules posts in Pinyin News