title Zúzalék fejjel tisztítás

participant SnowPlow
participant GravelHead
participant RoadSection 1

activate SnowPlow

[->SnowPlow:
SnowPlow->GravelHead: doCleaning(Map, RoadSection 1)
activate GravelHead

activate SnowPlow
deactivate SnowPlow

activate SnowPlow
deactivate SnowPlow

GravelHead->RoadSection 1: setGravel()
activate RoadSection 1
RoadSection 1-->GravelHead:
deactivate RoadSection 1


GravelHead-->SnowPlow:
deactivate GravelHead

[<--SnowPlow:
deactivate SnowPlow