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A curtain-sided articulated lorry at a warehouse loading bay at first light. The dark grey curtain is drawn back at the front, where pallets wrapped in clear film are held down by yellow ratchet straps.

Road haulage · Dagenham, east London

Strap by strap a loose load made immovable

Pallets standing on a bay at first light are only goods. Strap by strap they become a load that cannot move, and that is the work HAKEM TRANSPORT plans around: full loads, part loads, pallets and multi-drop rounds out of Dagenham along the A13.

Send a collection enquiry Work out the forces

A curtain-sided trailer, loaded and strapped Side view of a curtain-sided trailer. Nine pallets stand on the deck, the heavy low ones at the front against the headboard, with a yellow strap over each one and the curtain gathered at the rear. As the stages below are read, the drawing replays how the load got there: pallets arrive, red arrows show the force the load would exert, forward the whole weight and sideways and rearward half, and each strap shortens them until they are gone and the curtain closes. FORWARD: THE WHOLE LOAD SIDEWAYS: HALF REARWARD: HALF FRAME STRAPS: 400 KG AT MOST

The finished load placed, blocked, on friction, strapped

The load: waiting

On the bay, at first light

Before anything moves, the goods are only a list: how many pallets, how big, how heavy, and which can bear weight on top. We do not plan a vehicle around a guess. Weight decides the class of vehicle and where each pallet stands on the deck; length and access decide whether an artic with a 13.6 m trailer can reach the bay at all, or whether the job wants a rigid.

The list is read twice, once for the bay where the load starts and once for the place it comes off, because a forklift at one end and a pavement at the other are two different deliveries.

The load: placed

Placed: heavy, low and forward

Heavier goods go low and towards the front, and the weight is spread along the deck instead of heaped in one place, so no axle carries more than its share and the trailer handles as it should. Stretch-wrap holds a pallet together; it does not hold the pallet to the trailer.

Once on the deck the goods behave as one mass that wants to keep moving when the vehicle does not. The DVSA code of practice sets the basis we work to: the securing system must be able to hold the entire weight of the load forward, half of it to each side and half to the rear. In the drawing above they show as red arrows for as long as the load is loose.

Seen from above, to one scale. Two UK pallets stand side by side across a trailer's width with little to spare, so a gap is something we fill, not something we leave.

The load: blocked

Against the headboard

No gap left to gather speed in.

The first restraint forward is the front wall of the body, the headboard. Goods loaded hard against it cannot slide forward and then strike it; goods with a gap in front of them can, and a load that has travelled even a short way arrives with far more force than one that was already resting against the wall. Gaps between pallets are closed, or filled with blocking and dunnage, for the same reason.

A headboard holds only what it was built to hold, and that figure comes from the body's documents, not from how solid it looks.

The load: on friction

Friction, and the figure we assume

Friction between load and deck does real work, though less than most expect. The code of practice says to use a certified coefficient for a high-friction surface and otherwise 0.2. At 0.2, friction holds back a fifth of the weight in any direction, and the rest is left to blocking and lashing.

An anti-slip mat under each pallet raises the figure, and only the value on the maker's certificate is counted.

One part in five is held by friction at 0.2. The other four are left for the headboard, blocking and straps.
Close view of a yellow ratchet strap pulled tight over the top edge of a pallet load wrapped in clear film. The strap runs over a dark grey corner protector, the steel ratchet is in sharp focus, and a black anti-slip mat shows under the pallet on a dark trailer deck.
You cannot rely on the weight of a load aloneFrom the DVSA code of practice. Weight presses a load onto the deck; it does not hold it there.

The load: lashed

Lashed, and what each strap holds

A ratchet strap over the top of a load does not hold it by pulling. It presses the load harder onto the deck, and the extra friction is what holds it. For this top-over lashing the figure that matters on the label is the standard tension force, the STF, in daN, and not the larger lashing capacity, the LC, which is what a strap may carry when it ties the load directly to a lashing point.

Restraint forces

Type the load and the straps; the forces come out in daN on the DVSA basis, with the working shown underneath.

0.2 unless you hold a certificate for a high-friction surface, such as an anti-slip mat.
Blocked against the headboard?
Body
Kept in a shipper account; if you have none yet, you can open one on the way.

7,200 kg presses on the deck with 7,063 daN.

Forward, the whole weight5,651 daN

needed 7,063 · friction 1,413 · left for blocking and lashing

Sideways, half2,119 daN

needed 3,532 · friction 1,413 · left for lashing

Rearward, half2,119 daN

needed 3,532 · friction 1,413 · left for lashing

Each top-over strap adds 155 daN of friction. Straps for sideways and rearward: 14

Blocked against the headboard: the headboard has to be able to take 5,651 daN, which only the body's documents can confirm. Whatever it is not rated for is made up by direct lashing.

At a friction of 0.20 each strap adds little, which is why an anti-slip mat with a certified value comes before the straps.

This load is 7,200 kg. On a standard curtainsider anything attached to the frame, such as buckle straps or an internal net, secures 400 kg at most, so this load needs its own blocking and lashing inside the curtain.

How it is worked

  • Weight in daN is the mass times 9.81, divided by ten.
  • Forward the whole weight, sideways and rearward half: the DVSA basis.
  • Friction is the coefficient times the weight, the same in every direction.
  • Each strap presses down on both sides: 2 × STF × sine of the angle, times the friction.
  • Counts are rounded up. BS EN 12195-1 adds factors that raise them, so these are the least, never the most.
  • The curtain, the headboard's rating and an XL body are not counted.

The load: covered, not held

The curtain is not the restraint

A curtainsider's sides keep the weather out. On a standard body, anything fixed to the frame, such as the buckle straps along the bottom rail or an internal net, secures 400 kg at most; a heavier load is held inside the curtain by its own blocking and lashing.

Standard curtainsider

The curtain is weather protection. Frame-attached straps and nets count for 400 kg at most.

XL-rated body

Built to BS EN 12642, marked XL and documented, so its sides take part of the force as the certificate states. XL curtains on a standard body do not make it one.

The load: closed

Closed and checked

Only when the load is held does the curtain go across and the buckles get done up along the rail. Then the driver walks round before pulling out, and anything wrong goes on the defect report and is put right first. The height notice in the cab is set for the height the vehicle travels at, and a few miles out the straps are looked at again, because a load settles once it has felt the road.

A rigid lorry with a plain white box body crossing an elevated dual carriageway at blue hour, red and white light trails streaming past it, with the low silhouettes of riverside chimneys, tanks and cranes under a deep night-blue sky.
Out along the A13West to the North Circular, east to the M25 at junction 30, with Tilbury and the Thames-side estates on the way.

The load: opened

Opened at the other end

At the delivery address the vehicle books in at the time it was given. The curtain comes back, the straps come off one at a time and are checked as they are rolled, and the goods come off by forklift or tail-lift. The signature for them is the proof of delivery.

On a multi-drop round only part of the load leaves at each stop, so what remains is looked at and strapped again before the next one: a load that was immovable at the first bay is not immovable with a gap in the middle of it.

A haulage yard at night under tall white floodlights: a row of curtain-sided trailers stands on landing legs, and the wet concrete reflects the light in long streaks.
Then the deck is empty againand the next load starts as goods on a bay.

Your own bay: a shipper account

Keep the places you collect from and deliver to, with their bay hours, forklift or tail-lift and the limits on the way in. Raise enquiries from them, follow each one on the desk's timeline from Received to Delivered, and keep the calculations you work out above.

Open a shipper accountSign in

  • Pointswhere loads start and end, with their access notes
  • Loadsyour enquiries and where each one stands
  • Calculationsrestraint forces, ready to attach

Where is it now?

Every load we are asked about gets a reference the moment it is stored. With it and the collection postcode, consignment tracking shows each step the desk has set, from Received to the signature at the other end, and the people waiting for the goods can follow it as well.

The HAKEM TRANSPORT mark: a pallet load in signal yellow with one red strap and its ratchet.

What we carry

Full and part loads, pallets one or many, multi-drop rounds across east London and Essex, tail-lift deliveries, building materials to site, booked deliveries into distribution centres, trunk runs on the A13 and M25, and back-loads.

Every enquiry is read and answered by email with how we would move the load.

Send a collection enquiryWhat each load needs