The codes are in Latin, and thus, transliteration is not required (for example writing "P" as "R").
The highways of general government ("Republican") Significance are divided into three groups whose names differ by a code letter:[1]
М – international highways; their names and kilometer was retained by the road network of the Soviet Union
A – Highways military strategy between the main administrative, cultural and economic centers of Kazakhstan and neighboring countries as well as roads significance
P – other (regional) roads of national importance
There also are highways of Regional significance. Each region's highways get their own specific codes. The codes are in Latin, and thus, transliteration is not required.