Introduction: Custom-size variable speed limit signs help distributors, wholesalers and project-level OEM buyers match a highway signing package to the gantry, pole or tunnel structure already fixed in the project drawing.
Highway signing packages rarely arrive with a stock cabinet list. The civil design fixes the mounting points, service access and available display area, while the road authority fixes the speed values, languages and symbols. The factory has to turn those constraints into a cabinet that can be installed, controlled and maintained without reworking the steel around it.
Highway projects are built around fixed structures. Gantries, poles, tunnels, bridge decks and maintenance walkways are designed before a sign manufacturer receives an order. Gantry load limits, maintenance access, wind loading and cable routing are already set in the civil works. A standard cabinet may fit the display area but fail the mounting interface, leaving the contractor to add adaptor frames, change the mounting design, or accept a sign that is harder to service. Those fixes cost time and money and can delay installation. Cabinet dimensions therefore follow the mounting structure, project drawings and destination requirements rather than a stock size list. The display also shapes the cabinet. A dynamic speed limit sign has to be readable from the distance where drivers make decisions. Pixel pitch, message layout and cabinet depth work together. Available pixel pitches include P16, P20, P25, P31.25 and P33.33, so a distributor can match the sign to the road speed, viewing distance and structure. Lower pitch supports denser text and closer viewing, while larger pitch supports long-distance recognition and efficient cabinet coverage. Because the sign is part of the speed-management scheme, the message set must match the operating concept: variable limits during congestion, weather or incidents, lane-specific messages, or temporary works zones. MUTCD Part 2L and CIE colorimetry are useful background for message symbols and colour, while the final dimensions and content still come from the project drawing and end-user approval. In practice, the final size comes from the project drawing because the sign has to fit the steel that is already there.
Cabinet size is the first custom item. A project-level OEM order usually also locks display colour, pixel pitch, message set, communication interface, power mode and control software. These choices affect how the sign performs on the road and how easily the distributor can support the end user after installation.
The custom process starts with drawings. A cabinet size is quoted after the factory receives the mounting structure, pole or gantry interface, viewing distance, message set, languages, symbols, power supply, communication requirements, destination and order quantity. MOQ, price breaks and lead time are defined project by project, so the first quote depends on how complete the drawing package is. A complete package should show the mounting points, available width, height and depth, service access direction, cable entry position and the required speed display format. Distributors who send a full technical package get faster feedback and fewer design changes later. Distributors who regularly compare traffic safety equipment manufacturers should treat the drawing review as a first filter, because a supplier that cannot read the mounting drawing will slow the whole project. After the drawing review, a sample confirms the important details: text legibility, colour, interface position, cabinet finish and mounting points. The sample also allows the end user to check language rendering, symbol clarity and how the message zones behave when a speed value changes. Once the sample is approved, the project moves into tooling, assembly and testing for volume. That stage is where a factory’s production setup matters. OEM enclosure structure work may involve tooling for non-standard doors, mounting brackets or internal racks, while communication interface customisation may require connector panels and software configuration. The factory is worth checking these details against the approved sample before batch release. DAYU OPTOTECH Traffic Solutions supports this path with an in-house SMT clean workshop, automated assembly lines, aging tests, waterproof tests and high-low temperature tests. CE certification and issued test reports are available, and overseas project references include Spain, Australia, Thailand, Georgia, the United States, the UAE, Malaysia and Vietnam. Shipment comes from the Shenzhen production base, and the 2-year warranty covers the delivered sign.
Custom size variable speed limit signs are a project-fit decision. The cabinet has to match the gantry or pole, the display has to carry the right languages and symbols, and the factory has to follow the drawing from sample to volume. Distributors and project-level OEM buyers should send the mounting drawing, message list, language set, power mode, interface requirement, destination and quantity as early as possible. Then confirm the sample, the price break, the MOQ and the lead time before releasing the batch. This sequence keeps the sign compatible with the civil structure, the control system and the project schedule, and it gives the factory a clear basis for a project quote.
A：Yes. Cabinet size is made as per requirement, and the quote follows the drawings received. The final dimensions match the mounting structure, project drawings and destination requirements, so the sign fits the gantry or pole without site modification. MOQ, price breaks and lead time are defined for each project.
A：The sign uses a two-colour full matrix LED display, with single colour or full colour listed as options. Communication interfaces can include RS232, RS485, RJ45, GPRS, 3G and Bluetooth. Donartech control software supports message programming, and OEM/ODM development can cover enclosure structure and communication interfaces.
A：Send the mounting structure drawing, pole or gantry interface, preferred cabinet dimensions or available space, viewing distance, message set, languages, symbols, power supply mode, communication requirements, destination and order quantity. A project technical specification helps the factory quote accurately. The cabinet size is quoted after the drawings are received.
Chapter 2L - MUTCD 2009 Edition - FHWA
Colorimetry, 4th Edition | CIE
