If you ask 100 different producers what guidelines or rules of thumb they use in establishing delivery intervals, you're likely to get 100 different answers. Ask these same 100 producers, "How long should it take?" and you're likely to get the same answer: "It depends."

For measuring the overall efficiency of a delivery operation, cubic yards delivered per hour is still their best measure of efficiency, says Tim Green, ready mix operations manager with Hanson Aggregates in Phoenix.