What is a expressway?

Entering and Leaving Expressways Vehicles can enter and leave expressways only at certain points. Because expressway traffic is usually moving at or close to the maximum speed allowed, you need to...

http://www.usps.com/ncsc/lookups/usps_abbreviations.html

EXPY. or EXPR. with or without the periods.

Expy is the standard postal abbreviation.http://www.usps.com/ncsc/lookups/abbr_suffix.txtHere in Boston we also write XWAY. On really bad days we call it a parking lot.

watch for cars entering the expressway; if you stay in the right lane, adjust your speed or move into the center lane so they can enter safely