In the body text of articles, the first occurrence of a term to be abbreviated should be spelt out in full with the abbreviation to be used in the rest of the article following immediately afterwards in parentheses.
Abbreviations should be uniform and consistent and generally should not include full stops or periods.
In prose, do not use an ampersand (&) instead of spelling out and in full.
Using abbreviations is especially encouraged in listings.
Editors may want to choose the appropriate abbreviation from those below which are both widely understood and unambiguous. However, don't knock yourself out "correcting" Rt to Rte - there is more important work to be done in plunging forward and writing an up-to-date and accurate free Travel Guide!
Dates and times
Numbered highways in the US may be abbreviated like the following examples: