I brought a property 6 months ago, the house was built in 2021. In the last two months my waste drain got blocked twice. I have found the rason why its getting blocked, the solution looks to be more complex. The waste drain is on my own driveway which is private property (freehold). It appears that my waste pipe connects to a communal one which runs along in everyones driveway.  
The issue appears to be when I flush my upstairs toilets the waste come out of the pipe (circuled in red) instead of going down the centra pipe due to the fast speed it travels it overshoots and gets stuck in the blue section, this would then build up and fall into the central pipe and cause a blockage.
Does anyone know how can this be fixed and would it be my responsibility as its on my driveway or the water authority.