Vehicle restraints for loading bays

How much does a vehicle restraint cost?

A vehicle restraint typically costs £4,200 to £9,800 per bay, supplied and installed, excluding VAT. Sensor wheel chocks linked to the dock controls usually sit towards the lower end, and fully automatic wheel-based restraints with rail and interlocks towards the upper end.

What moves the price:

• Restraint type: a sensor chock needs far less hardware and groundwork than a powered, rail-mounted wheel restraint.
• Yard condition: rail-mounted units need a sound, level concrete apron. Broken concrete or tarmac may need a new base, priced after survey.
• Cabling: the distance from the restraint to the dock control panel, and whether ducts must be cut into the yard.
• Integration: linking to existing door and leveller controls is simpler on modern panels; older panels may need replacing.
• Number of bays and working hours: several bays in one project spread set-up costs, while out-of-hours work adds cost.

All figures are guide budgets. After a free site survey we send a written quote, and that quote is the fixed price. VAT is added at the standard rate.

What does HSE guidance say about preventing drive-away?

HSE guidance says there must be safeguards to stop drivers driving away from a loading bay too early, and it lists vehicle or trailer restraints as one of the measures. The others it names are traffic lights and the person in charge keeping the vehicle keys or paperwork until it is safe to leave.

This comes from HSE's guide to workplace transport safety (HSG136) and its loading and unloading factsheet. The guidance sets out the outcome rather than one fixed solution, so the right combination for your site should follow your own risk assessment.

Once fitted, a restraint is work equipment under the Provision and Use of Work Equipment Regulations 1998 (PUWER), so it must be suitable, maintained in a safe condition and inspected where deterioration could lead to danger. In Northern Ireland the equivalent is PUWER (Northern Ireland) 1999, and the regulator is HSENI rather than HSE.

Our guide to preventing drive-away and trailer creep compares the options side by side.

Wheel-based or hook restraint: which suits UK trailers?

Wheel-based restraints and sensor wheel chocks suit most UK trailers, because they act on the rear wheel rather than on the back of the vehicle. Hook restraints, which catch the rear impact guard (sometimes called an ICC bar), are common elsewhere but suit fewer UK fleets.

• Wheel-based restraint: a steel guide rail fixed to the yard, with an arm or chock that moves against the rear wheel, either powered or pushed into place by the operative. It works regardless of tail lifts or underrun guard design.
• Sensor wheel chock: a heavy chock placed in front of the wheel, with a sensor or parking station that tells the dock controls it is in position. Lower cost and minimal groundwork, but it relies on someone placing it each time.
• Hook restraint: mounted on the dock face and hooking the rear guard. UK and European trailers vary widely at the rear, and tail lifts often get in the way, so this type needs checking against your actual fleet.

Which types and options are available?

Typical specification

What happens on site when a vehicle restraint is installed?

Installing a vehicle restraint takes the bay out of use while the rail or chock station is fixed, cabled and tested, but neighbouring bays can usually keep working.

1. Set out: the restraint position is marked in line with the bay so it meets the rear wheels of the trailers you receive.
2. Fixing: rail-mounted units are anchored into the concrete apron. If a new concrete base is needed, it must cure before the restraint is fitted.
3. Cabling: ducts are cut or laid from the restraint to the dock wall, and the control box is fitted inside next to the door.
4. Connection: the restraint is wired into the door, leveller and traffic light controls so the sequence works as designed.
5. Commissioning: the system is tested with a trailer on the bay, and dock staff are shown how to engage and release it.

We ask you to release the bay for the agreed period, confirm an electrical supply point, provide a trailer for commissioning and tell us about any buried services in the yard.

How does a vehicle restraint work with dock lights and interlocks?

A vehicle restraint is normally linked to the dock traffic lights and the door controls, so engaging the restraint is what allows loading to start.

A typical sequence looks like this:

1. The trailer reverses on to the bay with the outside light on green and the door closed.
2. The restraint engages the rear wheel. The outside light turns red for the driver and the inside light turns green for dock staff.
3. The door can now be opened, and the leveller can only operate once the door is fully open.
4. When loading is finished, the leveller is parked and the door closed before the restraint can release.
5. The restraint releases, the outside light turns green and the driver can leave.

The exact interlocks depend on your equipment and risk assessment. See dock traffic lights and interlocks for the options on signals and control logic.

What is trailer creep and how does a restraint stop it?

Trailer creep is the gradual movement of a parked trailer away from the dock, caused by forklifts braking and accelerating as they drive on and off the trailer bed. Each movement pushes the trailer forward slightly, and over a full load the gap can grow.

Creep is more likely when:

• the trailer is uncoupled from its tractor unit and resting on its landing legs;
• air suspension or brakes have not been set correctly by the driver;
• forklifts are heavy, fast or carrying dense loads such as drinks or building materials;
• the yard falls slightly away from the building.

As the trailer moves, the leveller lip can lose its bearing on the trailer bed, and in the worst case the lip slips off with a forklift on it. A wheel-based restraint holds the wheel against the rail or chock, so the trailer cannot travel forward however many times a forklift drives on and off.

When is this the right choice?

• Drivers have pulled away while a forklift was still inside the trailer or on the leveller.
• Trailers creep forward during loading, opening a gap at the leveller lip.
• Your risk assessment relies on key control alone and you want a physical safeguard.
• You handle uncoupled trailers or third-party hauliers whose drivers you do not manage.
• You are adding traffic lights and interlocks and want the door tied to the trailer.

How the job runs

1. Site survey

   We check the trailers you receive, the yard surface, the approach to each bay and your existing door and leveller controls to decide which restraint type will work.

2. Written quote

   You get a written quote covering the restraint, groundworks, cabling and interlocks, with anything excluded made clear. The survey and quote are free and without obligation.

3. Installation

   The bay is released for the agreed period while the restraint is fixed, ducts and cables are run and the controls are connected to the door and lights.

4. Testing and handover

   Every step of the sequence is tested with a trailer on the bay, dock staff are shown how to use the system and the documentation is handed over.

Vehicle restraints for loading bays: questions

Related equipment and services

• Dock traffic lights and interlocksRed and green signals and control interlocks for safe dock sequencing.
• Dock lights and wheel guidesSwing-arm dock lights and steel wheel guides for accurate reversing.
• Loading bay servicingPlanned maintenance for doors, levellers, shelters and restraints.

Further reading

• Preventing drive-away and trailer creep at the loading dock
• Specifying the dock package for a new warehouse

Vehicle restraints for loading bays by area