The first prototype bus 5252 series large capacity was created all-Union Institute of experimental design-bus construction in Lviv in 1977-1978. The bus had a širmovye door, rear door was one-folding-door wider did not allow making engine, housed in the back eaves. Simultaneously with the model 5252 has also developed a similar design of model 5256, which in the end of 80-ies mastered Likinsky bus plant under the name Liaz-5256. It should be noted that draft trehdvernogo large capacity city bus in Lviv were developed long before that-back in the 60 's there was a Laz-696, later, in 70-s-bus. But instead of developing this sector takes in the Summit considered that "Icarus" may well satisfy the needs of the USSR in the buses of this class