International routes are given a "CA-" designation followed by a highway number (i.e. CA-1) that can be of one or two digits enclosed in a highway shield.  "CA-" highways are part of the Central American highway network (hence the "CA" letters) that interconnects Honduras with its neighboring countries as part of the Pan-American Highway.  National highways are assigned a two or three-digit number and provincial routes are assigned a three-digit number.