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 South Yorkshire choose this?
Loading docks in South Yorkshire where drivers wait in their cabs for a hand signal can replace guesswork with a clear red and green light at every bay. Older docks in South Yorkshire with separate door and leveller controls can be brought into a proper sequence by adding interlocks that stop equipment working out of order.
If a site in South Yorkshire has had door panels damaged by levellers raised too early, a leveller-to-door interlock is a straightforward fix to consider.
For dock traffic lights and interlocks in South Yorkshire, we begin with a free site survey and a fixed written quote, so you know the scope and cost before committing. We take responsibility for managing the job, and specialist installation engineers carry it out under our supervision. Bays are taken out of use in a planned sequence so the rest of the dock keeps working, and evening or weekend work can be arranged. Each item is tested at handover and the documentation is left with you.
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.
How do inside and outside dock traffic lights work together?
Inside and outside dock lights always show opposite colours: when the driver sees red, dock staff see green, and the other way round. Each light is aimed at a different person, so each one only ever gives one instruction.
- Outside light, facing the driver: red means stay on the bay because loading is in progress; green means the bay is clear to leave or to reverse on to.
- Inside light, facing dock staff: green means the trailer is in place and it is safe to open the door and load; red means do not open the door or enter the trailer.
Lights can be switched in three main ways:
- Manually, by a switch beside the door, relying on dock staff to change it at the right moment.
- By door position, so opening the door automatically turns the outside light red.
- By the restraint, so the light only changes when the trailer is physically held.
Towns we cover in South Yorkshire
Each of the following towns in South Yorkshire has its own page on dock traffic lights and interlocks, covering how we work and what to send us.
- Sheffield
- Rotherham
- Doncaster
- Barnsley
- Bentley
- Chapeltown
- Darton
- Dinnington
- Adwick le Street
- Rawmarsh
- Maltby
- Thorne
- Wath-upon-Dearne
- Conisbrough
- Hoyland
- Wombwell
- Mexborough
Budget range for supply and fit. The written quote after a free survey is the fixed price. All guide prices.
What do the rules in England mean for the work?
Powered doors and dock equipment installed in England may carry the UKCA or the CE mark, and doors are covered by the product standard BS EN 13241. We hand over the relevant documentation for each item fitted in South Yorkshire. Planning and Building Regulations questions are never assumed either way: we check what applies at survey, so you know before work is booked.
Questions
What warranty comes with new loading bay equipment?
New equipment comes with the manufacturer's warranty, which varies by product. Our workmanship terms are set out in writing in the quote for your South Yorkshire site, so you can see what is covered before you commit. Check the warranty terms for any servicing conditions, and we can quote for planned maintenance once the installation is complete.
Can you work outside our normal operating hours in South Yorkshire?
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.
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.
Do traffic lights and interlocks need maintenance?
Yes. Lights, sensors and interlocks should be checked at each planned service visit, including testing the full sequence and confirming that steps attempted out of order are blocked. As part of the dock equipment they fall under PUWER, which requires work equipment to be maintained in a safe condition.
Other services in South Yorkshire
Full guide to dock traffic lights and interlocks · All loading bay services in South Yorkshire