MUTCD Table 6H-1 Guide
The definitive engineering standard for roll-up sign dimensions, retroreflectivity, and temporary traffic control compliance under the 11th Edition (Revision 1).
Table Redesignation
If you are looking for Table 6F-1, it has been officially redesignated. Under the 11th Edition of the MUTCD, warning sign sizes are now codified under Table 6H-1.
Conventional Road Sizes
For standard advance warning signs (e.g., Road Work Ahead) deployed on conventional roadways, the mandatory baseline dimension is 36 x 36 inches.
Freeway/Expressway Sizes
Due to higher kinetic velocities and required perception-reaction times, the minimum dimension strictly increases to 48 x 48 inches on freeways and expressways.
Frequently Asked Technical Questions
What are the nocturnal retroreflectivity requirements for orange roll-up signs?
Roll-up signs deployed at night must utilize elastomeric microprismatic sheeting, categorized under ASTM D4956 as Type VI. The 11th Edition of the MUTCD enforces strict quantitative minimums in Table 2A-5: an orange sign measuring 48 inches or larger must maintain a minimum of 50 cd/lx/m2. Signs smaller than 48 inches must maintain a minimum of 75 cd/lx/m2. Non-reflective mesh materials completely fail this standard and are strictly prohibited for nighttime use.
Why is "Fluorescent Orange" highly recommended over standard orange?
The MUTCD explicitly permits and encourages the use of fluorescent orange because it provides markedly higher conspicuity than standard pigments. Fluorescent materials physically absorb non-visible ultraviolet (UV) radiation and re-emit it as visible light. This is a critical optical advantage during the transitionary, low-light hours of dawn and dusk when vehicular headlights are ineffective but ambient sunlight is too low for standard pigments.
Do portable roll-up sign stands need to be crash-tested?
Yes. The FHWA mandates that all Category II temporary traffic control devices, which includes portable sign stands and roll-up signs, must be entirely crashworthy to prevent windshield penetration upon vehicular impact. While older inventory was tested under NCHRP Report 350, modern state directives demand that newer hardware be successfully crash-tested under the more rigorous AASHTO MASH (Manual for Assessing Safety Hardware) criteria.
