Routing Guide: Definition for Freight Audits

A routing guide sets which carrier and service level applies before a shipment moves, and it is the reference point contract compliance audits check freight.

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Routing Guide: Definition for Freight Audits

A routing guide is the document that tells a shipper's vendors and warehouse staff which carrier and service level to use for a given shipment, before it moves. For an AP or procurement team, it is not paperwork filed alongside the contract: it is the reference point an invoice must be checked against, separate from the rate card that prices the shipment once the carrier is already known.

1. What does a routing guide actually contain?

A routing guide assigns a required carrier and service level to each lane, zone, or shipment type, with thresholds for weight, dimensions, or product category that change the assignment. It also states approved exceptions, such as which backup carrier to use when the primary carrier cannot take a load, and sometimes a required transit time or delivery window.

It is written before shipments move, not derived from how they were actually shipped.

2. Why does routing guide compliance matter for freight invoices?

An invoice priced correctly against the carrier that actually handled a shipment can still represent a cost the shipper never agreed to, if that carrier was not the one the routing guide required. Checking the math on an invoice answers whether the carrier billed correctly. Checking the invoice against the routing guide answers whether the right carrier was used at all.

Those are two different questions, and reviewing only the first misses the second entirely.

3. How does a routing guide differ from a rate card?

A routing guide decides which carrier and service level a shipment should use. A rate card prices that shipment once the carrier is known. A vendor can bill exactly to the rate card and still generate margin drift, because the rate card was applied to a carrier the routing guide never authorized in the first place.

First confirm the carrier and service level against the routing guide for that lane and weight.

Only then price the shipment against that carrier's rate card. Reversing the order, starting from the invoice's carrier and pricing it correctly, skips the question of whether that carrier should have been used at all.

4. What causes routing guide violations in practice?

Violations arise from mechanisms, not carelessness: a vendor shipping collect on its own carrier relationship instead of the shipper's designated one, an outdated guide that no longer names the lowest-cost lane carrier, or a dock decision made without checking the current document at all. Each produces the same downstream effect, an invoice priced correctly for a carrier that was never the required one.

Identifying which mechanism is at work determines whether the fix is a policy update, a system control, or a vendor conversation. For the wider pattern this sits inside, see the coverage of the wider pattern of margin drift, and for a related class of invoice items that go unchecked, see accessorial charges nobody validates, plus guidance on how to tell them apart from legitimate price increases.

  • Vendor default carrier: A vendor ships on its own account and carrier relationship rather than the routing guide's assignment, often because it is faster at the dock.
  • Outdated guide: Lane volumes or carrier contracts changed, but the routing guide was never revised to reflect the new best option.
  • No exception documented: The primary carrier could not take the load and no approved backup was named, so staff chose one without a rule to follow.

For the wider pattern this sits inside, start with the margin drift guide.

5. Frequently Asked Questions (People Also Ask)

What is a routing guide in freight shipping?

A routing guide is a shipper's written instruction set naming the required carrier and service level for each lane, zone, or shipment type. It exists so carrier selection is decided once, in writing, rather than at the dock each time a shipment moves.

Is a routing guide the same as a shipping contract?

No. The contract sets pricing and terms with a carrier. The routing guide tells staff and vendors which carrier to use for a given shipment in the first place. A shipment can be billed correctly under the contract and still violate the routing guide.

Who is responsible for following the routing guide?

Whoever books the shipment, whether that is warehouse staff, a vendor shipping on the shipper's behalf, or a third-party logistics provider. The routing guide only works as a control if the party booking the shipment checks it before selecting a carrier.

Can a vendor override the routing guide and still bill correctly?

Yes. If a vendor ships on its own carrier relationship instead of the one named in the routing guide, the resulting invoice can be priced exactly to that carrier's rate card and still represent a cost the shipper never authorized.

How often should a routing guide be updated?

There is no fixed schedule that fits every shipper. The guide needs review whenever lane volumes, carrier contracts, or service levels change, because an outdated guide keeps naming a carrier that is no longer the correct choice.

What happens when the primary carrier can't take a load?

The routing guide should name an approved backup carrier for that lane. When no backup is documented, staff choose a carrier without a rule to follow, which is one of the mechanisms behind routing guide violations.

Does a freight audit check routing guide compliance automatically?

Checking an invoice's math against a rate card answers whether the carrier billed correctly. It does not answer whether that carrier was the one the routing guide required. Those are separate checks and both need to happen.

Where does routing guide compliance fit in a contract compliance audit?

It sits alongside rate card, surcharge, and NTE cap checks as one of the reference documents an invoice is matched against. A contract compliance audit tests the invoice against each of these separately, not just against price.

1. What does a routing guide actually contain?

A routing guide assigns a required carrier and service level to each lane, zone, or shipment type, with thresholds for weight, dimensions, or product category that change the assignment. It also states approved exceptions, such as which backup carrier to use when the primary carrier cannot take a load, and sometimes a required transit time or delivery window. It is written before shipments move, not derived from how they were actually shipped.

2. Why does routing guide compliance matter for freight invoices?

An invoice priced correctly against the carrier that actually handled a shipment can still represent a cost the shipper never agreed to, if that carrier was not the one the routing guide required. Checking the math on an invoice answers whether the carrier billed correctly. Checking the invoice against the routing guide answers whether the right carrier was used at all. Those are two different questions, and reviewing only the first misses the second entirely.

3. How does a routing guide differ from a rate card?

A routing guide decides which carrier and service level a shipment should use. A rate card prices that shipment once the carrier is known. A vendor can bill exactly to the rate card and still generate margin drift, because the rate card was applied to a carrier the routing guide never authorized in the first place. First confirm the carrier and service level against the routing guide for that lane and weight. Only then price the shipment against that carrier's rate card. Reversing the order, starting from the invoice's carrier and pricing it correctly, skips the question of whether that carrier should have been used at all.

4. What causes routing guide violations in practice?

Violations arise from mechanisms, not carelessness: a vendor shipping collect on its own carrier relationship instead of the shipper's designated one, an outdated guide that no longer names the lowest-cost lane carrier, or a dock decision made without checking the current document at all. Each produces the same downstream effect, an invoice priced correctly for a carrier that was never the required one. Identifying which mechanism is at work determines whether the fix is a policy update, a system control, or a vendor conversation. For the wider pattern this sits inside, see the coverage of the wider pattern of margin drift, and for a related class of invoice items that go unchecked, see [accessorial charges nobody validates](/guides/accessorial-charge-audit-the-surcharges-nobody-validates), plus guidance on how to tell them apart from legitimate price increases. - Vendor default carrier: A vendor ships on its own account and carrier relationship rather than the routing guide's assignment, often because it is faster at the dock. - Outdated guide: Lane volumes or carrier contracts changed, but the routing guide was never revised to reflect the new best option. - No exception documented: The primary carrier could not take the load and no approved backup was named, so staff chose one without a rule to follow. For the wider pattern this sits inside, start with the [margin drift](/insights/margin-drift-spend-leakage-guide) guide.

Questions & Answers

What is a routing guide in freight shipping?

A routing guide is a shipper's written instruction set naming the required carrier and service level for each lane, zone, or shipment type. It exists so carrier selection is decided once, in writing, rather than at the dock each time a shipment moves.

Is a routing guide the same as a shipping contract?

No. The contract sets pricing and terms with a carrier. The routing guide tells staff and vendors which carrier to use for a given shipment in the first place. A shipment can be billed correctly under the contract and still violate the routing guide.

Who is responsible for following the routing guide?

Whoever books the shipment, whether that is warehouse staff, a vendor shipping on the shipper's behalf, or a third-party logistics provider. The routing guide only works as a control if the party booking the shipment checks it before selecting a carrier.

Can a vendor override the routing guide and still bill correctly?

Yes. If a vendor ships on its own carrier relationship instead of the one named in the routing guide, the resulting invoice can be priced exactly to that carrier's rate card and still represent a cost the shipper never authorized.

How often should a routing guide be updated?

There is no fixed schedule that fits every shipper. The guide needs review whenever lane volumes, carrier contracts, or service levels change, because an outdated guide keeps naming a carrier that is no longer the correct choice.

Margin Drift Resources