Will This Fit My Car?

How to secure cargo in your car safely

Updated · 5 min read

An item that fits isn't automatically safe to carry. In a hard stop or a collision, anything loose in the car keeps moving at the speed you were travelling. A heavy box in the boot, a TV on the back seat or a stack of books can hit the seatbacks, or the people sitting in front of them, with real force. This guide covers general principles for securing a load inside a car. It's not a substitute for your vehicle handbook or for professional advice on unusual loads.

What the official guidance says

UK: the Highway Code

Rule 98 of the Highway Code (vehicle towing and loading) says that you must not overload your vehicle or trailer, and that you must secure your load and it must not stick out dangerously. It adds that you should make sure any heavy or sharp objects and any animals are secured safely, because in a collision they might hit someone inside the vehicle and cause serious injury. The Highway Code applies in England, Scotland and Wales, and its introduction explains that rules using the words "must" or "must not" are legal requirements. Disobeying them is a criminal offence. The laws listed under Rule 98 include the Road Vehicles (Construction and Use) Regulations.

US: NHTSA and AAA

The US National Highway Traffic Safety Administration (NHTSA) runs a "Drive Safe: Secure Your Load" safety page. It encourages drivers to tie items down, cover loose loads and avoid overloading. Research by the AAA Foundation for Traffic Safety estimated that road debris was a factor in 319,724 crashes, 32,802 injuries and 433 deaths in the US between 2018 and 2023. Cargo, commonly furniture, sporting equipment and miscellaneous objects, was one of the main sources of debris. Rules on unsecured loads vary by state, so check your local regulations.

Principle 1: Heavy items low and forward

  • Put the heaviest items on the floor of the boot, pushed right up against the back of the rear seats (seats up) or the backs of the front seats (seats down).
  • Keep the load's centre of gravity low. Lighter items go on top, never the other way round.
  • Spread the weight evenly from side to side.
  • Don't leave a heavy item loose near the tailgate with empty space in front of it. In a stop it slides forward and gathers speed before it hits something.

Principle 2: Seats and occupants

  • Make sure seatbacks are latched. Upright rear seatbacks act as a barrier between the boot and the cabin, but only if they're properly locked. Check the red or green latch indicators on cars that have them.
  • Don't load where someone is sitting. If you've folded part of the rear bench, keep the load in the folded section and away from the passenger.
  • Use the seatbelt for items on a seat. A box or bag on a rear seat can be held with the seatbelt fastened through or around it. That's better than nothing, though not a substitute for proper restraint for heavy items.
  • Long loads beside passengers, such as items running through to the front passenger footwell, are a particular risk. Avoid carrying a passenger beside a long, heavy load. Make sure airbags aren't obstructed, and check your handbook for any warnings about placing objects near airbag zones.

Principle 3: Tie it down or box it in

  • Use the lashing points. Many boots have fixed lashing eyes or hooks. Use them with ratchet or cam straps, or a cargo net. Bag hooks are for shopping, not for restraining heavy items.
  • Pack tightly. A load with no room to move is much harder to dislodge. Fill gaps with soft items.
  • Consider a barrier. In estates (wagons) and SUVs, a dog guard or cargo barrier designed for your car separates the load space from the cabin. Choose products designed and tested for your vehicle.
  • Don't overtighten on fragile items. Straps should stop movement without crushing cartons, TVs or mattresses.

Principle 4: Keep your view and controls clear

  • Keep the load below the line of the rear seatbacks where possible.
  • If the interior mirror is blocked, make sure both door mirrors are correctly adjusted before you set off.
  • Nothing should be able to roll into the driver's footwell or interfere with the pedals, gear selector or handbrake.

Principle 5: Never overload

Every car has a maximum permitted weight, and exceeding it affects braking, steering and tyres. The limits are in your vehicle handbook, and often also on a plate or label on the car. In the US there's usually a tyre and loading information placard on the driver's door pillar. Heavy loads may call for adjusted tyre pressures, so follow the handbook. If the car sits noticeably low at the back, the load is too heavy. Split it across trips.

Principle 6: Roof and overhanging loads

Roof loads are subject to the roof load limit in your handbook and the limits of your roof bars or box. Loads that stick out beyond the car need particular care and may be subject to specific rules. If the load sticks out of the boot or windows, the tailgate won't close, or you'd need to drive with it open, use a different vehicle. Driving with an open tailgate can let exhaust fumes into the cabin and leaves the load unsecured.

Before you drive: a quick checklist

  1. Heaviest items low and against a seatback.
  2. Seatbacks latched. Folded sections have no passenger in them.
  3. Load strapped, netted or packed tight so it can't slide.
  4. Tailgate fully closed. Nothing sticking out.
  5. Mirrors adjusted. Controls and footwells clear.
  6. Total weight within the handbook limits. Tyre pressures checked.
  7. Re-check the load after the first few miles.

Then drive accordingly: brake earlier, corner more gently and leave more space. A loaded car handles differently from an empty one.

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