Conveyor belts do not always use the rigth next step.
In the top there is 2 Chassis Assemblers, the lower one feeds the 3 lower Fit Body, while the top one only feed the top Fit body, it never feed the 3 others.
In the button there is the same there is 4 Fit Engine and 2 Fit Accessories. The 3 first only go to the first Fit Acc. while the top one only goes to the top one.
This make trafic chaos on the Conveyors, and all stations is connectet