I was playing sandbox, after most of the construction was done, suddenly material trucks stopped coming for new constructions. I tried everything including moving location of the Loading Bay, placing some more loading bay's. I even tried dismissing contractors and again hiring them.
All other vehicles continued to come (Bus, Cars, Contractor's Bus)
I don't know if it's a bug or i may have accidentally done something wrong
Also, i play on steam, hence i don't know the Version of the same