Milk runs: one vehicle, several suppliers, fixed route

A circuit with a published timetable

The route, the sequence and the arrival window at each supplier are fixed and repeat on a known cadence. Suppliers are told when the vehicle will be at their gate and what will be taken. Because the round is a single journey rather than a set of unrelated jobs, the vehicle is used far more fully than it would be collecting from each site separately, and the receiving bay sees one arrival instead of many.

Small quantities, taken often

Frequent collection lets each supplier ship what has actually been consumed rather than a large batch built to justify a vehicle. That keeps inbound stock low at the receiving plant and smooths the flow across the working week. The inventory reasoning behind it belongs to supply-chain planning; what concerns transport is that the vehicle must be sized for the round rather than for any single supplier.

Standard handling units keep the circuit honest

Milk runs almost always run on returnable containers, stillages or standard pallets that the vehicle brings back empty on the outbound pass and collects full on the inbound one. Standardisation lets the driver load without weighing, measuring or repacking, and lets the load plan be known before the vehicle sets off. Where each supplier presents different packaging, dwell time at every gate rises and the timetable stops holding.

When a supplier is not ready

The round cannot wait, because everyone after that stop is expecting a window. Mature operations define what happens instead: the driver takes what is staged, records the shortfall, and the missing quantity moves on the next pass or by a separate urgent movement if the shortage will halt production. Allowing the vehicle to wait converts one supplier's problem into everyone's problem.

Where a fixed circuit stops paying

The model depends on suppliers being reasonably close together and on volumes staying modest and steady. Once one supplier's quantity approaches a vehicle load, it should be moved directly instead. Once the circuit spans too much distance, driving time crowds out collection time. Highly variable volumes also break the design, because a fixed vehicle either runs half empty or cannot take what is offered.

Frequently asked questions

What happens if goods are not ready when the vehicle arrives?

The driver takes whatever has been staged and continues, so later stops keep their windows. The shortfall is recorded and recovered on the next pass, or moved separately if production would otherwise stop.

Why do milk runs rely on returnable containers?

Because standard units let the driver load quickly and predictably, and the empties travelling outbound fill deck space that would otherwise be wasted. Non-standard packaging slows every stop and makes the load plan unknowable in advance.