At the beginning of the 1970s, the authorities of Polish People's Republic decided to upgrade their city transport fleet.
For this purpose already in years 1970–1972 on Warsaw streets it have been started to test such bus models as: Hungarian Ikarus 242, West German Magirus-Deutz M170-S11H, French Berliet PR100, Italian FIAT 420A, British-Danish Leyland Lidrt 12/4 Worldmaster, Spaniard Pegaso 5023, Japanese Hino RC620 and Czechoslovak Karosa SM11.
The winner was Berliet PR100.
From the beginning this model 
was considered as temporary because of bigger transportation needs and it was planned to expand it by adding third door.
New Jelcz PR110 was 12-meters bus provided with three doors.
These vehicles were being made in 50% with parts imported from France.

The crisis of the 1980s meant that Polish People's Republic government didn't have foreign currency to buy parts for these vehicles.
Parts imported from abroad for one bus by prices from the beginning of 1984 costed 2000 US dollars.
They couldn't be bought in Polish factories.
In addition, the WSK Mielec engine factory could produce only up to 1,000 engines per year.
Because of this it has been decided to start cooperation with Hungarian People's Republic.
Trade agreement between Poland and Hungary signed in Warsaw 24 October 1983 assumed deliveries to Polish cities Ikarus 260 buses and Csepel 260.88 chasis (which were used inter alia in Ikarus 260 buses).
In return, the Hungarian side was receiving Polish Fiat 125p's i 126p and Star trucks.
According to the agreement Hungarian People's Republic had to deliver in years 1986–1990 about 1500 complete chasis with driving system.
Even then, it was found that Jelcz M11's (initially named Jelcz M110) were supposed to be a temporary solution and their production should be finished at the moment of appearance Jelcz M120's, produced by Polish industry at all.
Problems with 
exploitation and failure rate of Jelcz M11's accelerated working on new models.
At the beginning of the 1970s, the authorities of Polish People's Republic decided to upgrade their city transport fleet. For this purpose already in years 1970–1972 on Warsaw streets it have been started to test such bus models as: Hungarian Ikarus 242, West German Magirus-Deutz M170-S11H, French Berliet PR100, Italian FIAT 420A, British-Danish Leyland Lidrt 12/4 Worldmaster, Spaniard Pegaso 5023, Japanese Hino RC620 and Czechoslovak Karosa SM11. The winner was Berliet PR100. From the beginning this model 
was considered as temporary because of bigger transportation needs and it was planned to expand it by adding third door. New Jelcz PR110 was 12-meters bus provided with three doors. These vehicles were being made in 50% with parts imported from France.
The crisis of the 1980s meant that Polish People's Republic government didn't have foreign currency to buy parts for these vehicles. Parts imported from abroad for one bus by prices from the beginning of 1984 costed 2000 US dollars. They couldn't be bought in Polish factories. In addition, the WSK Mielec engine factory could produce only up to 1,000 engines per year. Because of this it has been decided to start cooperation with Hungarian People's Republic. Trade agreement between Poland and Hungary signed in Warsaw 24 October 1983 assumed deliveries to Polish cities Ikarus 260 buses and Csepel 260.88 chasis (which were used inter alia in Ikarus 260 buses). In return, the Hungarian side was receiving Polish Fiat 125p's i 126p and Star trucks. According to the agreement Hungarian People's Republic had to deliver in years 1986–1990 about 1500 complete chasis with driving system. Even then, it was found that Jelcz M11's (initially named Jelcz M110) were supposed to be a temporary solution and their production should be finished at the moment of appearance Jelcz M120's, produced by Polish industry at all. Problems with 
exploitation and failure rate of Jelcz M11's accelerated working on new models.
Jelcz M11