Using abbreviations is encouraged.
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 the World's most complete, up-to-date and accurate free Travel Guide!
Note: The abbreviations below are emboldened for clarity of exposition but, of course, we don't use bold face for abbreviations in Wikitravel articles just because its an abbreviation!
Dates and times
Streets and roads
Numbered highways in the US are abbreviated as follows: