Army Regulation 385-55 is no longer a standalone regulation. It was superseded when its content was folded into AR 385-10 (The Army Safety Program), but the traffic control device standards it once carried remain fully binding on Army installations through 32 CFR Part 634 and mandatory compliance with the Manual on Uniform Traffic Control Devices (MUTCD).1U.S. Army. AR 385-10 – The Army Safety Program If you’re managing installation roadways, driving on them, or trying to figure out which document controls, the short answer is: don’t look for AR 385-55 as a live document, look to AR 385-10, 32 CFR Part 634, the MUTCD, and the DoD Supplement to the MUTCD.
Where the Traffic Control Standards Live Now
AR 385-55 was originally published on March 12, 1987, and governed signs, signals, and pavement markings on Army installations for decades. When AR 385-10 absorbed the Army’s broader safety program requirements, AR 385-55’s standalone status ended.1U.S. Army. AR 385-10 – The Army Safety Program The technical rules didn’t disappear with it. They now flow from three connected sources:
- 32 CFR Part 634 (Motor Vehicle Traffic Supervision), the federal regulation governing DoD installation traffic, which requires facility engineers to conform all signs, signals, and pavement markings to the current MUTCD.2eCFR. 32 CFR Part 634 – Motor Vehicle Traffic Supervision
- The MUTCD itself, adopted as the national standard for traffic control devices on any road or bicycle trail on a military installation.
- The DoD Supplement to the MUTCD, which recognizes the MUTCD as the controlling standard and adds military-specific guidance, incorporated by reference through 32 CFR Part 634, Subpart D.3U.S. Army. Department of Defense Supplement to the National Manual on Uniform Traffic Control Devices
So the regulation number changed. The requirements did not.
What the Rules Cover and Who Must Follow Them
The standards apply to all Army installations, government-owned or leased lands, and tactical training areas open to public travel. Every roadway, parking facility, and pedestrian area where vehicles or foot traffic are controlled falls within scope. Commanders are required to conform to the MUTCD on all installation roads.3U.S. Army. Department of Defense Supplement to the National Manual on Uniform Traffic Control Devices
The related joint regulation AR 190-5 (Motor Vehicle Traffic Supervision) reaches anyone serving in or employed by the military services and the Defense Logistics Agency, along with Reserve Component personnel operating privately owned vehicles on military installations.4Defense Logistics Agency. Military Police Motor Vehicle Traffic Supervision (AR 190-5) If you drive, walk, or cycle on an Army installation, the traffic control devices around you are governed by these rules.
The MUTCD Edition Currently in Force
On December 19, 2023, FHWA published a Final Rule adopting the 11th Edition of the MUTCD. It took effect on January 18, 2024, and states were given two years from that effective date to adopt it, making January 18, 2026 the compliance deadline.5Federal Highway Administration. Information by State – FHWA MUTCD The 11th Edition superseded the 2009 Edition. Because 32 CFR Part 634 ties compliance to “the current” MUTCD, military installations operating under the DoD Supplement should align with the edition currently in force.2eCFR. 32 CFR Part 634 – Motor Vehicle Traffic Supervision
Signs, Signals, and Pavement Markings
Every traffic control device on an installation must meet MUTCD specifications for design, color, shape, and placement. Signs sort into three functional categories:
- Regulatory signs impose legal requirements (stop signs, speed limits) and must be properly installed for the rule they display to be enforceable.
- Warning signs alert drivers to hazards ahead, such as curves or construction zones.
- Guide signs provide destination, mileage, and directional information.
Traffic signals have a higher bar. The MUTCD requires a formal engineering study analyzing traffic conditions, pedestrian activity, and the physical characteristics of the location before any signal is installed. The study evaluates specific warrant criteria including vehicular volume, peak-hour traffic, pedestrian volume, school crossings, crash history, and roadway network factors. A signal should not be installed unless at least one warrant is met and the study indicates it will improve safety or operations at that intersection.6Federal Highway Administration. 2009 Edition Chapter 4C – Traffic Control Signal Needs Studies
Pavement markings, including lane lines, crosswalks, and symbols, follow the same uniformity standards. A driver moving from Fort Liberty to Joint Base Lewis-McChord should encounter the same marking conventions.
Retroreflectivity and Ongoing Maintenance
Signs that read clearly during the day can vanish at night once reflective sheeting degrades. FHWA requires agencies responsible for roadways to use an assessment or management method designed to keep sign retroreflectivity at or above the minimum levels in MUTCD Table 2A-3. Compliance means having a method in place and actually using it. An agency remains compliant even if a few individual signs temporarily fall below the minimum, provided the system is catching and fixing them.7Federal Highway Administration (FHWA). Minimum Sign Retroreflectivity Requirements
Acceptable methods include visual nighttime inspections using calibration signs, direct measurement with retroreflectometers, expected sign life schedules, blanket replacement programs, and combinations of these. Minimum levels vary by sign type. White-on-red regulatory signs like stop signs, for example, need a white retroreflectivity of at least 35 candelas per lux per square meter and a red value of at least 7, with a minimum contrast ratio of 3:1.7Federal Highway Administration (FHWA). Minimum Sign Retroreflectivity Requirements
Some categories are exempt from retroreflectivity minimums, including parking and standing signs, walking and hitchhiking signs, and signs with blue or brown backgrounds. Those exempt signs must still meet all other MUTCD standards for design and installation.
Engineering Studies Before New Devices Go In
No new traffic control device should be installed without a formal engineering study justifying it. This is where installations frequently fall short: a commander wants a stop sign at a dangerous intersection and it goes up without the underlying analysis. That creates both liability exposure and enforcement problems.
Under 32 CFR Part 634, installation traffic engineers are responsible for conducting formal traffic engineering studies and applying traffic control measures to reduce accident frequency and severity. If an installation lacks a traffic engineer, commanders can request engineering services through channels from the Commander, Surface Deployment and Distribution Command (SDDC, formerly the Military Traffic Management Command). SDDC’s Transportation Engineering Agency (SDDCTEA) provides support ranging from limited studies of specific problem areas to comprehensive studies of an entire installation’s traffic operations.2eCFR. 32 CFR Part 634 – Motor Vehicle Traffic Supervision
Studies collect data on existing roads, traffic density, flow patterns, and congestion points. The installation law enforcement officer and traffic engineer typically run them together, because the data drives both engineering solutions and enforcement priorities.
Getting a Deviation From MUTCD Standards Approved
Sometimes an installation needs a device that doesn’t exist in the MUTCD, or needs to modify a standard device for a military-specific purpose. Any variance in design or application must be approved by SDDC and FHWA.3U.S. Army. Department of Defense Supplement to the National Manual on Uniform Traffic Control Devices That request does not stay inside the installation’s chain of command; it reaches federal highway authorities, because installation roads are held to the same national standard as public roads.
For waivers to AR 385-10 more broadly, the regulation’s proponent (the Director of Army Staff) has authority to approve exceptions consistent with controlling law and may delegate that authority in writing to a division chief in the grade of Colonel or civilian equivalent. Any waiver request must include full justification analyzing expected benefits and a formal review by the activity’s senior legal officer.8Department of the Army. Army Regulation 385-10 – The Army Safety Program
Who Is Responsible on the Installation
The installation commander carries ultimate responsibility for compliance, but the work is distributed. Under 32 CFR Part 634, the facility engineer handles planning, design, procurement, installation, and maintenance of permanent traffic and parking control devices, coordinating with the law enforcement officer and the installation safety officer. The facility engineer must also ensure streets and highways conform to the National Highway Safety Program Standards as implemented by the Army. The traffic engineer conducts formal studies and recommends engineering solutions. The law enforcement officer aligns enforcement priorities with the physical road environment.2eCFR. 32 CFR Part 634 – Motor Vehicle Traffic Supervision
Devices also need ongoing inspection. Signs deteriorate, posts get knocked down, markings wear away. Devices that are obsolete, damaged beyond repair, or no longer warranted should be removed. Leaving an outdated sign in place confuses drivers who trust that every posted sign reflects a current requirement.
Enforcement itself depends on the devices being properly installed. 32 CFR Part 634 ties traffic law enforcement directly to the adoption of standard signs, markings, and signals in accordance with the MUTCD.9eCFR. 32 CFR Part 634 Subpart D – Traffic Supervision If a regulatory sign does not conform to MUTCD standards, enforcing the rule it displays becomes legally problematic. Keeping devices compliant is what makes the traffic supervision program enforceable in the first place.