Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →The public agency or official with jurisdiction over the road is responsible for its traffic-control devices, including changeable message signs (CMS) and their operation. The person who actually types or approves a message is determined by that agency’s procedures, the sign’s purpose, and any contract covering the site. A state transportation department, county, city, toll authority, or another designated highway agency may run a permanent sign. A contractor may operate a portable sign at a work zone, but that does not automatically remove the public agency’s overall responsibility.
This explanation applies to roads in the United States. The controlling national standard is the Federal Highway Administration’s Manual on Uniform Traffic Control Devices (MUTCD), 11th Edition, published in 2023, together with the responsible state’s and locality’s policies and contracts.
As an Amazon Associate I earn from qualifying purchases.
What “changing a roadside sign” actually involves
A lighted roadside board that can show different words is generally a changeable message sign. The MUTCD defines a CMS as a traffic-control device capable of displaying one or more alternative messages. That definition matters because the board is not treated like an ordinary advertising display. Its messages, placement, operation, and maintenance are governed by traffic-control rules.
Several responsibilities can be separated even when the public sees only one sign:
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
- Jurisdiction and accountability: The public agency or official legally responsible for the road remains accountable for the traffic-control device.
- Equipment ownership or furnishing: The agency may own a permanent sign, while a contractor may furnish a portable unit for a project.
- Day-to-day operation: An agency traffic-management center, field office, maintenance crew, or an authorized contractor may enter the message under local procedures.
- Message development and approval: Technical staff decide what the sign should say and how it should be formatted, subject to the agency’s policy and the MUTCD.
Those roles can be held by different organizations. Finding the operator therefore does not by itself answer who is responsible for the sign.
Permanent highway signs: the jurisdictional agency is responsible
For a permanently installed or positioned CMS, responsibility starts with the public agency that has jurisdiction over the highway. Depending on the road, that may be a state department of transportation, a county or municipal highway department, a toll-road authority, or another public road owner. The agency is responsible for the device’s design, placement, operation, and maintenance, even if a vendor supplied equipment or a private party performs some operational work under contract.
The MUTCD does not assign every sign to one nationwide job title. It does not say that a particular kind of CMS must always be changed by a state dispatcher, a police officer, a maintenance supervisor, or a named control room. Instead, the agency with jurisdiction establishes an operating arrangement that fits its network.
What the local CMS policy must cover
For permanently installed or positioned CMS, state and local highway agencies must maintain policies addressing how the signs are used. Those policies cover the types of messages allowed, their priority, the syntax or wording conventions, timing, and related operational elements. A policy may also define who can request a message, who reviews it, who authorizes it, and which staff have access to the sign-control system. Those details vary by agency, so a neighboring state or city may use a different workflow without violating the national standard.
Why the agency remains accountable when a contractor is involved
A maintenance, technology, or traffic-management contractor can perform work for the agency, but a contract does not turn the sign into a private traffic device. The public agency’s policy and the contract determine the contractor’s authority. The agency still has to ensure that messages follow traffic-control requirements and that the device is operated safely.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Temporary work-zone signs: who operates a portable CMS?
Road projects often use portable CMS mounted on trailers. A contractor may furnish and operate one of these signs when the public agency’s construction requirements allow it. The contractor’s operation can include moving the trailer, connecting power, entering an approved message, and maintaining the unit. That practical role is different from the agency’s ultimate responsibility for traffic control on the project.
There is no single nationwide allocation of duties for every work zone. The governing state manual, project specifications, and contract determine the arrangement. As a specific example, the North Carolina Department of Transportation construction manual says the Division Engineer has ultimate responsibility for messages used on changeable message signs, while a contractor is responsible for operating a contractor-furnished sign. That is a North Carolina rule, not a universal rule for all states.
Questions to ask at a work zone
- Which public agency has jurisdiction over the project?
- Does the contract identify the contractor as the party furnishing or operating the portable CMS?
- Who approves the wording before it is displayed?
- Does the project use an agency-owned sign, a contractor-furnished sign, or both?
The answers identify the operational chain without confusing the equipment supplier with the authority responsible for traffic control.
What messages are allowed on a CMS?
Section 2L.02 of the 2023 MUTCD states: “CMS shall display only traffic operational, regulatory, warning, and guidance information except as otherwise provided in this Chapter.” In practical terms, a sign can warn drivers about a crash or queue, provide route or detour guidance, communicate a traffic regulation, or give an operational instruction such as a lane or ramp status. The sign is not a general-purpose billboard.
The permitted categories explain why a public agency, rather than an informal group or an individual driver, controls the message. A short, dramatic phrase that attracts attention may still be unsuitable if it does not convey traffic information in the form required by the MUTCD and the agency policy.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
How wording is developed
Agencies normally use conventional traffic-sign principles: concise wording, recognizable abbreviations, legible line breaks, and a sequence that drivers can read while moving. The agency policy determines the syntax and timing for its network. A technical representative may translate a field report into an approved legend, select a standard warning, or remove a message when the condition ends.
FHWA’s January 4, 2021 interpretation addresses public involvement in that process. It says that if public input is solicited on traffic-control devices, it should inform the message developed and displayed by agency technical representatives, “in accordance with conventional sign legend syntax.” Public comments can therefore provide useful information about a hazard or confusing condition, but they do not give commenters authority to publish wording directly to the sign.
Who can request, approve, and enter a message?
Because agencies set their own policies, these functions may be distributed among several people:
| Function | Typical responsible party | What the national standard establishes |
|---|---|---|
| Overall responsibility | Public agency or official with jurisdiction | The jurisdictional authority is responsible for traffic-control devices, including operation. |
| Message request | Field staff, incident managers, law enforcement, or another authorized agency unit | No universal job title is specified. |
| Message development and approval | Agency technical representatives under the CMS policy | Messages must follow MUTCD principles and the agency’s policy. |
| Message entry | Authorized agency operator or, where permitted, a contractor | The local operating arrangement controls. |
| Portable work-zone operation | Sometimes the contractor that furnished the unit | Project requirements and state practice determine the assignment. |
| Maintenance and repair | Agency staff or an agency-authorized contractor | The public agency remains accountable for the device. |
This is why two signs displaying similar warnings can be changed by different people in different jurisdictions. The visible board does not reveal the internal staffing model.
How to identify the responsible agency for a specific sign
If you need to know who changed a message, or who can correct it, use the road’s jurisdiction rather than guessing from the sign’s appearance.
Free tools Windows power users keep installed
One-click scans. No signup required.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
- Identify the road owner. Look for the route number, toll-road name, city boundary, county boundary, or project signs. State routes are commonly handled by the state transportation agency; city and county roads are handled locally, but exceptions exist.
- Determine whether the sign is permanent or portable. A trailer, wheels, temporary supports, or a work-zone setup indicate a portable CMS. A pole-mounted board on a fixed structure is usually permanent, although the agency still needs to be confirmed.
- Check the project information. Work-zone signs often identify a project office, resident engineer, emergency number, or contractor. That information can reveal the operational contact without proving that the contractor has final authority.
- Use the agency’s traffic or road-conditions contact. Call the transportation agency, local public-works department, toll authority, or 311 service for the location. Ask for the unit responsible for the CMS or traffic-management center.
- Report the exact sign and message. Provide the road, direction of travel, nearest exit or intersection, date and time, displayed wording, and the problem you observed. A precise report lets the responsible unit verify whether the message is still needed.
What to do if the message appears wrong
Do not stop on the shoulder, approach the cabinet, or attempt to access a sign-control device. If the message creates an immediate safety risk, contact emergency services while remaining in a safe location. For a non-emergency error, use the road agency’s official reporting channel and include a photograph only if it can be taken legally and safely by a passenger or from a safe stopped location.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common misunderstandings about roadside message signs
“The person who typed it is responsible for everything.”
Not necessarily. The operator may be an authorized employee or contractor acting under an agency policy. Overall responsibility still rests with the public agency or official having jurisdiction.
“The contractor owns the sign, so the contractor controls traffic.”
Furnishing a portable sign can give a contractor an operating duty, especially on a construction project, but it does not automatically transfer public authority. The contract and the agency’s construction requirements define the contractor’s limits.
“Drivers can vote on the exact wording.”
Public input can inform an agency’s decision, but FHWA’s 2021 interpretation places message development and display with agency technical representatives using conventional sign-legend syntax.
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →“Every flashing yellow word board is controlled from a state headquarters.”
The national standard does not establish one control room or staffing model. A local agency, regional traffic center, field office, or authorized contractor may operate a particular sign.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
“A CMS can display any public-service announcement.”
The MUTCD limits CMS content principally to traffic operational, regulatory, warning, and guidance information, subject to the exceptions in Chapter 2L. An agency policy may be more specific about what qualifies and how long a message may remain active.
What the 2023 MUTCD changes for this question
The 11th Edition of the MUTCD, published in 2023, is the relevant edition identified for U.S. practice here. It provides the national framework, including the definition of a CMS, the content rule in Section 2L.02, and the expectation that agencies with permanently installed or positioned signs maintain policies for message types, priority, syntax, timing, and related matters.
Federal standards can be amended or replaced. Before relying on a particular requirement for a legal dispute, project specification, or formal complaint, check the current FHWA MUTCD material and the applicable state and local policy. The road agency’s own policy and the project contract may contain operational details that the national manual leaves to local choice.
PC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe practical answer in one sentence
On a U.S. road, the agency or official with jurisdiction is responsible for the changeable message sign; an authorized employee or contractor may enter the words, and a contractor may operate a contractor-furnished portable unit at a work zone, but the governing agency’s policy and contract determine the exact division of labor.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
