The Role of Supply Chain Planning in Managing Primary Freight Expenditure
How Planning Turns Freight Costs Into a Managed Investment
Supply chains don’t just move goods – they move capital. Every shipment, every lane, and every truckload represent money leaving or staying in your business. When you examine it closely, transportation is often the largest cost in the supply chain.
That’s why a well-planned approach to supply chain management is more than just theory – it’s the lever that determines whether your freight-spend benefits you or erodes your margins.
There are three ideas that are often considered separately but are actually closely linked:
What is supply chain planning, and how does it influence primary freight costs?
Effective planning, including load optimization and shipment leveling, can significantly lower your transportation cost management challenges
The ripple effect that planning can have on secondary freight and customer service
What is Supply Chain Planning?
The definition reads something like this: Supply chain planning is the structured process of aligning demand, inventory, production, and logistics to make sure products move through the chain efficiently.
At its core, it’s about balancing two opposing forces: customer service expectations and cost efficiency. The scope of supply chain planning covers:
- Demand forecasting – Knowing what will be needed, when, and where
- Inventory positioning (Supply Planning) – Deciding where stock should sit across the network to minimize lead time and transportation costs
- Production scheduling – Aligning plants and suppliers with transportation capacity
Think of Supply Chain Planning as the translation layer between strategy and execution.
Supply chain planning should also include transportation planning, but it rarely does. Transportation is often the “tail of the dog”, being directed by both customers, who receive shipments from distribution centers, and deployment planners.
Effective transportation planning would significantly help coordinate primary and secondary freight movements and ensure high order fulfillment rates, delivering on time at the lowest reasonable cost.
Without holistic transportation planning, operations become a reactive mess – expediting shipments here, paying surcharges there, and chasing capacity when things go wrong.
With coordinated planning, transportation turns into a predictable, optimized process where freight spend is a managed investment, not an uncontrolled cost.
Transportation planning must be an integrated part of supply chain planning. This is where many companies either gain or lose control of their freight spend.
Supply Chain Planning
- Demand Forecasting
- Inventory Positioning
- Production Scheduling
Primary vs. Secondary Transportation Costs
Why the Distinction Matters:
Most organizations track “transportation costs” as a single line item. That’s a mistake. Primary versus secondary transportation costs behave differently and require different management strategies. If you don’t separate them, you won’t see where planning failures are leading to higher expenses.
Primary Transportation Costs involves the long-distance movement of goods – from manufacturing facilities to regional distribution centers or from ports to warehouses.
These are usually full truckload, intermodal, or ocean/rail shipments. They make up the “bulk shift” of inventory through the main channels of the supply chain.
Primary freight has certain characteristics:
High cost per move – but lower cost per unit when optimized
Sensitive to planning errors – poor supply planning results in half-empty trailers, too many shipments for preferred carriers to handle, or expedited full loads
Heavy reliance on volume leveling – uneven demand spikes can cause surcharges and spot rate increases
Secondary Transportation Costs, by contrast, involves the last-mile or regional moves – from distribution centers to retailers, stores, or end customers.
These shipments may be in truckloads or smaller (LTL, parcel, or regional truckload) and tend to be more variable. The customer is “king”.
Secondary freight has its own dynamics:
Lower cost per move but higher cost per unit.
Customer-driven variability
Centered on service metrics, on-time, in-full (OTIF) delivery often takes priority over cost considerations.
Primary Transportation Spend Management hurt by Supply Chain Planning
Most people focus on the wrong things when analyzing transportation spend; freight bill audits, rate negotiations, and carrier scorecards. Those matter, but they overlook the self-inflicted wounds caused by siloing planning away from the rest of the supply chain.
- Planning drives volatility – primary freight costs are high because core (preferred) carriers experience feast or famine conditions. Most planning systems focus mainly on keeping safety stocks constant. This results in a sawtooth pattern of daily fluctuations
Daily Volume
2. Supply plans ignore capacity constraints – distribution centers and supplying plants do not have unlimited labor to load and unload shipments, nor do they always have enough space to store the product. This causes significant overtime, detention and delays
3. Missing Optimization – failing to utilize tools like payload maximization, shipment leveling, and network design to minimize waste
Transportation managers and brokers negotiate pennies per mile. Good planning saves dollars per mile.
Planning Drives Lower Primary Freight Costs
If primary transportation is the backbone of your network, then planning is the strength of that backbone. Here are the main levers:
Load Optimization
Every partially filled trailer represents a cost leak. Load optimization involves consolidating requirements into fuller truckloads. While this sounds simple, the calculations are very complex because you must consider payload, proper loading to be axle-legal, and ensuring the load arrives undamaged. (If you want to learn more about this go to https://provisionai.com/autoo2/)
Leveling Shipments
Volatility – uneven deployment patterns increase costs. A plant that ships heavily at the end of the week, or a DC that handles large spikes at month-end, causes bottlenecks and capacity issues. Carriers respond by charging premiums – or worse, rejecting loads and forcing the use of haulers that don’t drop trailers or aren’t “SmartWay certified”.
Leveling means smoothing shipment volumes across, say, 30 days:
- Coordinate deployment with warehouse and transportation capabilities
- Replenish early to prevent end-of-month surges that correspond to customer surges
- Holistically manage space and network-wide moves
The result is steadier demand for carriers, which translates into lower contracted rates and fewer costly spot-market moves. (If you want to learn more about this go to https://provisionai.com/levelload/)
Network Design and Inventory Positioning
Planning isn’t just tactical. Where you locate warehouses, how you source raw materials, and how you route flows, all shape your transportation profile. A poorly designed network results in longer hauls and unnecessary moves. A well-designed one reduces primary freight lanes and cuts overall miles.
Common Mistakes &
How Planning Fixes Them
Common Mistakes That Inflate Primary Transportation Costs
Even sophisticated supply chains make preventable errors that increase freight spend:
Putting It All Together:
Planning as Spend Control
When supply chain planning is effective, transportation expense management becomes proactive:
- Treating primary and secondary costs as the same is incorrect – they need different strategies
- Failing to coordinate production and logistics – plants release products whenever they are ready, regardless of load efficiency or actual demand
- Overdependence on spot markets – this generally results from inadequate planning, not unfavorable rates
- Ignoring shipment variability causes higher costs – due to peaks and valleys in shipping volumes
- Neglecting cross-functional coordination – procurement, sales, and logistics often make decisions in silos that weaken transportation efficiency
- Primary freight is optimized by load consolidation, shipment leveling, and accurate forecasting
- Secondary freight is managed through customer alignment, smart routing, and service-level agreements
- Total transportation costs are transparent, segmented, and manageable – not just reported after the fact
Why Does Supply Chain Planning Matter to Transportation Spend Management?
The answer is simple: planning is the only way to control primary freight costs before they spiral out of control.
Carriers, brokers, and 3PLs can help trim around the edges, but the biggest savings aren’t in rate negotiations – they’re in planning. Load optimization, shipment leveling, and accurate forecasting cut waste in primary freight.
Smart network design reduces miles and consolidates flows. Together, these strategies turn transportation from a reactive expense into a managed, predictable investment.
Companies that continue to plan in a silo will keep overpaying without realizing it. Companies that approach planning strategically will develop transportation networks that are lean, reliable, and cost-effective.