11.1 Performance Standards and Restraint Methods
Key Takeaways
Loading performance standards include 0.8g forward and 0.5g rearward and sideways, applied separately.
The additional 0.2g vertical requirement applies when friction or limited vertical displacement is relied on for the horizontal performance.
Direct restraint resists movement through attachment, containment or blocking; tie-down relies on clamping and friction, with pretension and angle affecting performance.
Restrain the forces, not just the appearance
A load can move when the vehicle brakes, turns, accelerates or travels over an uneven surface. It may injure others, alter axle loading or make the vehicle unstable. The law requires safe load placement, appropriate restraint and compliance with performance standards. The Load Restraint Guide provides technical guidance for choosing a suitable system; it does not turn every illustrated arrangement into a universal legal prescription.
The latest NHVR guide is the 2025 edition, and NHVR states that the 2018 edition remains valid because the changes are relatively minor. Use the guide and current loading law together. The standards describe ordinary transport performance demands; they are not a guarantee that cargo remains in place through every collision or rollover.
Directional standards
| Direction | Minimum performance reference | Practical hazard |
|---|---|---|
| Forward | 0.8g deceleration | Heavy braking drives cargo toward the front |
| Rearward | 0.5g deceleration | Cargo moves toward the rear |
| Sideways | 0.5g acceleration | Cornering or lateral movement |
| Vertical | 0.2g when the specified reliance applies | Reduced contact or vertical displacement affects restraint |
The horizontal directions are tested separately. The vertical requirement applies where friction or limited vertical displacement is relied on to meet them. Do not describe it as an unconditional requirement for an arbitrary lifting strap in every system, or ignore it in a friction-dependent arrangement.
For a simple force example, assume a 1,000 kg load and gravitational acceleration 9.81 m/s². Its weight is 9,810 N. The forward 0.8g reference is 7,848 N, approximately 7.85 kN. A 0.5g sideways or rearward reference is 4,905 N, about 4.91 kN. The relevant 0.2g vertical reference is 1,962 N. The inputs and units are explicit; a '1 tonne strap' cannot automatically be judged adequate from the cargo’s mass alone.
Direct restraint
Direct restraint uses attachment, blocking or containment to resist movement. A rated headboard, cradle, gate, wall or connection can transfer load forces into the vehicle structure. The entire load path must be adequate: restraint, fittings, anchor points, structure and the load’s own attachment points. A strong chain on a weak hook is limited by the weak connection.
Blocking works when cargo is close enough to the rated structure to transfer force without an uncontrolled run-up. A large gap allows impact and can increase demands. Combine methods where needed. For example, blocking that provides 0.3g of forward restraint still needs sufficient additional restraint to reach 0.8g; it does not make every other direction compliant.
Tie-down restraint
Tie-down applies clamping force over the load so friction at the contact surfaces resists horizontal movement. Its performance depends on pretension, friction, geometry, contact and equipment condition. The strap’s lashing capacity is not the same as the pretension produced by its tensioner. A high-rated strap can provide inadequate clamping if it is loose or poorly routed.
A steep tie-down angle provides more downward force than a shallow one at the same tension. For an illustrative strap with two equal-tension legs, each at 60 degrees to the deck and tension 500 N, the downward components total twice 500 times sine 60 degrees, approximately 866 N. This is a simplified geometry example, not an equipment recommendation. Actual tension can differ on each side because of friction and tensioning arrangements.
Friction varies with materials and contamination. Oil, water, dust, loose packaging or a smooth surface can reduce the assumed resistance. Suitable friction material may help, but use verified performance and protect it from damage. Do not choose a generous coefficient without evidence simply to reduce the number of lashings.
Stability, packaging and load shape
The cargo itself must tolerate the restraint. A strap tightened over a crushable carton can loosen after the carton deforms. A rounded item can roll unless supported and restrained appropriately. A tall item can tip even if sliding is prevented. Packaging or stretch wrap may hold a unit together but not secure it to the vehicle.
Keep heavy goods low and avoid off-centre placement. Check that partial unloading leaves a stable and restrained arrangement. Every independent item needs a suitable path to the restraint; a top strap that contacts only the highest piece may leave lower or outer pieces free.
Inspect and recheck
Inspect tags, ratings, cuts, wear, corrosion, hooks, tensioners and anchor points before use. Use edge protection appropriate to the load and restraint. Tension through the correct procedure without standing in a recoil path. Recheck after settling, rough travel, a significant manoeuvre or unloading, and at suitable safe opportunities under the loading plan. Do not present an invented universal 25 km legal recheck interval.
If the load shifts, stop safely and correct its position and restraint before continuing. Retightening around a now-unsafe distribution is not enough. Report the problem and arrange suitable equipment or assistance when needed.
Key decisions
Choose a system meeting every applicable direction, verify the whole load path and distinguish capacity from pretension. Secure appearance is not evidence of performance.
Official sources
Current MDL Regulation, Schedule 7; NHVR Load Restraint Guide; performance standards. Sources checked 10 October 2026.
Why does a webbing strap marked with a lashing capacity of 2.5 tonnes not automatically secure a 2.5-tonne load by tie-down?
Every strap can only restrain half its label regardless of method
Cargo weight alone determines the required strap count
Tie-down also depends on pretension, friction, angles, contact and the full restraint system
The tag guarantees compliance in every direction
Sections you finish are checked off in the contents.