A vehicle restraint is a device at a loading bay that physically holds a trailer against the dock until it is safe to leave. In the UK most systems act on the rear wheel, either as a powered wheel-based restraint or a sensor wheel chock. Restraints guard against early drive-away and trailer creep, and are usually interlocked with the door and dock traffic lights.
Why do sites in Cambridgeshire choose this?
Multi-tenant logistics parks around Cambridgeshire can benefit from restraints when several tenants share yard space and trailers from different fleets arrive throughout the day. Yards around Cambridgeshire that park uncoupled trailers at the dock can see trailers creep under forklift traffic, and a wheel-based restraint helps keep the leveller lip on the bed.
A warehouse in Cambridgeshire that already uses traffic lights may want to add restraints so the door cannot open until the trailer is physically held in place.
Any project involving vehicle restraints at a working site in Cambridgeshire takes planning. We survey free of charge, quote a fixed price in writing, and then agree a programme that keeps as much of the dock running as possible. Specialist installation engineers carry out the work under our management, out of hours if that suits you better. On completion we test each item, show your team how it operates and leave the documentation with you.
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.
- Set out: the restraint position is marked in line with the bay so it meets the rear wheels of the trailers you receive.
- 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.
- Cabling: ducts are cut or laid from the restraint to the dock wall, and the control box is fitted inside next to the door.
- Connection: the restraint is wired into the door, leveller and traffic light controls so the sequence works as designed.
- 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.
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.
Towns we cover in Cambridgeshire
Each of the following towns in Cambridgeshire has its own page on vehicle restraints, covering how we work and what to send us.
Budget range for supply and fit. The written quote after a free survey is the fixed price. All guide prices.
Which rules apply in England?
Sites in Cambridgeshire fall under the rules for England. Structural changes such as forming a new opening or a dock leveller pit may need Building Regulations approval, and external structures such as loading houses, canopies or new dock approaches can need planning permission from the local planning authority. We check what applies at survey and build any approvals into the plan.
Questions
Will you deal with building control and planning for a project in Cambridgeshire?
We check at survey whether the work is likely to need approval. Forming a new opening or dock pit may need Building Regulations approval, a building warrant or building control approval, depending on the nation, and external structures such as loading houses can need planning permission. Where approval is needed, we explain what is involved, work with your designer or agent, and build it into the programme.
What details do you need from us to quote for vehicle restraints?
To get started, send the site address in Cambridgeshire, the number of bays or openings, approximate sizes, and photos of the dock from inside and outside. Tell us what vehicles you load, what goods you handle and any temperature requirements. Drawings help on new builds. We then arrange the free survey and confirm the details before the written quote is issued.
Will a vehicle restraint slow down loading?
Engaging a restraint adds only a short step to each docking, and once it is part of the interlock sequence it becomes routine for dock staff. Many sites find that a clear sequence actually reduces delays, because there is less confusion about when it is safe to open the door or release the driver.
Do vehicle restraints work with all trailers?
Wheel-based restraints and sensor chocks work with most trailers, because they act on the rear wheel rather than on the back of the vehicle. Vehicles with unusual wheel positions or very small wheels need checking, so we look at the vehicles you receive during the survey.
Other services in Cambridgeshire
Full guide to vehicle restraints · All loading bay services in Cambridgeshire