- Location
- Lerwick, Orkney, Shetland and the Western Isles
- Main postcode district
- ZE1
- Nearby (straight line)
- Remote location, covered by arrangement
- Survey and quote
- Free, with a fixed written quote
Dock traffic lights are red and green signals mounted outside and inside a loading bay to tell the driver and dock staff when it is safe to move or load. Interlocks are control links that stop equipment operating out of sequence, for example preventing the door opening until the trailer is restrained, or the leveller operating until the door is fully open.
Why do sites in Lerwick choose this?
Sites around Lerwick that run night shifts often find traffic lights easier for drivers to read than staff waving or knocking on the cab door. Distribution centres near Lerwick taking trailers from many different hauliers benefit from a signal every driver understands, regardless of language or familiarity with the site.
New warehouses in Lerwick can have lights and interlocks wired in during the electrical fit-out, avoiding retrofit cabling and keeping every bay on one control standard.
Keeping the dock running is usually the first concern, so we plan around it. After a free survey of your Lerwick site and a written quote at a fixed price, we agree when each bay can be released and whether any work should happen out of hours. Specialist installation engineers working under our management then fit the equipment, and we test it and hand over the documentation before the bay goes back into use.
What happens on site when traffic lights and interlocks are fitted?
Fitting lights and interlocks is mainly electrical work, and each bay is out of use while its controls are connected and tested. Working bay by bay keeps the rest of the dock running.
- Fix the signals: the outside light is mounted on brackets at a height drivers can see, and the inside light beside the door.
- Run the cables: wiring is run in conduit or trunking between lights, sensors and control panels.
- Isolate and connect: the door and leveller supplies are isolated and locked off while the interlock wiring is connected, or a new bay panel is fitted.
- Test every sequence: each interlock is tested, including what happens if a step is attempted out of order.
- Brief staff: dock staff are shown the new sequence, and signs are fitted for drivers.
It helps if you can provide any electrical drawings for the dock, access to the distribution board, a person who can authorise isolations and an agreed order for releasing bays.
Which interlocks should a loading bay have?
The most useful loading bay interlocks stop the door opening until the trailer is in place or restrained, and stop the leveller operating until the door is fully open. Beyond that, the right set depends on the equipment fitted and your risk assessment.
- Door to restraint: the door cannot open until the restraint is engaged or a trailer is detected.
- Leveller to door: the leveller cannot be raised until the door is fully open, which prevents the lip hitting door panels.
- Door to leveller: the door cannot close until the leveller is back in its parked position.
- Restraint release: the restraint only releases once the door is closed and the leveller parked.
- Shelter to trailer: an inflatable shelter only inflates when a trailer is docked.
On a bay without a restraint, a trailer presence sensor can take its place in the door logic, although it confirms a trailer is there rather than holding it. Combining interlocks with vehicle restraints gives the strongest protection against drive-away.
The same published guide range applies across Scotland; access, out-of-hours working and site conditions are confirmed at the free survey.
Survey checklist for your dock
- Temperature requirements for chilled, frozen or ambient goods
- Scope to convert ground-level doors into docks or add lift tables
- Gaps around trailers where heated or chilled air escapes
- Yard gradient and the slope of the approach to the dock
- Forklift and pallet truck loads crossing the leveller platform
- Wall and steel structure for door, shelter and bumper fixings
Options to discuss
Restraint interlock package
Door, lights and vehicle restraint tied together so the door only opens once the trailer is held and the restraint only releases when loading is finished.
Full bay interlock panel
A single control panel that runs the door, leveller, restraint and shelter in the correct sequence, with indicators showing which step is active or blocked.
Planning, building control and safety law in Scotland
Energy standards for buildings in Scotland are set out in Section 6 of the Building Standards Technical Handbook. For new or replacement loading bay doors in Lerwick, we confirm the figure that applies to your project and check what applies at survey, rather than relying on rules written for elsewhere in the UK.
We cover Lerwick by arrangement. The survey and written quote stay free: for remote and island sites we often start from your photos, drawings and a video call, then confirm measurements on site. Travel and any accommodation needed for the installation are shown as separate lines in the fixed quote.
Questions about dock traffic lights and interlocks in Lerwick
Can you work outside our normal operating hours in Lerwick?
Yes, by arrangement. Evening, night and weekend working can be planned so the installation causes as little disruption as possible to your loading schedule. Out-of-hours work can affect the price, so mention it at the survey and we will include it in the written quote. The agreed times are confirmed in the programme before the job starts.
What details do you need from us to quote for dock traffic lights and interlocks?
To get started, send the site address in Lerwick, 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.
Is the site survey in Lerwick free?
Yes. For new installations, replacements, upgrades, conversions and complete bays, the site survey and written quote are free and come with no obligation. The survey lets us measure the openings, check the dock and structure, and understand how the bay is used, so the quote reflects your site. Repair and servicing visits are different: they are chargeable, with the price agreed before anyone attends.
Can interlocks be fitted to a manual loading bay door?
Yes. A door position switch fitted to a manual door can confirm when it is fully open or fully closed. That signal lets the traffic lights change automatically and stops the leveller being raised until the door is out of the way.
Will interlocks slow down my loading operation?
Interlocks add a fixed sequence, but each step takes only moments and staff soon get used to it. In practice many sites find the sequence saves time overall, because there are fewer arguments about when to open the door and less damage from levellers being raised into part-open doors.
Dock traffic lights and interlocks near Lerwick
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