MUTCD 11th Edition
Page 29
- responders to incidents within the right-of-way; and law enforcement personnel when directing traffic, investigating crashes, and handling lane closures, obstructed roadways, and disasters within the right-of-way.
- Wrong-Way Arrow—a slender, elongated, white pavement marking arrow placed upstream from the ramp terminus to indicate the correct direction of traffic flow. Wrong-way arrows are intended primarily to warn wrong-way road users that they are going in the wrong direction.
- Yellow Change Interval—the first interval following the green or flashing arrow interval during which the steady yellow signal indication is displayed.
- Yield Line—a row of solid white isosceles triangles pointing toward approaching vehicles extending across approach lanes to indicate the point at which the yield is intended or required to be made.
Section 1C.03 Meanings of Acronyms and Abbreviations Used in this Manual
Standard:
[01] The following acronyms and abbreviations, when used in this Manual, shall have the following meanings:
- AADT—annual average daily traffic
- AASHTO—American Association of State Highway and Transportation Officials
- AC—alternating current
- ADA—Americans with Disabilities Act
- ADAS—Advanced Driver Assistance Systems
- ADS—Automated Driving System
- ADT—average daily traffic
- AFAD—Automated Flagger Assistance Device
- ANSI—American National Standards Institute
- AREMA—American Railway Engineering and Maintenance-of-Way Association
- AV—automated vehicle
- cd/lx/m2—candelas per lux per square meter
- CFR—Code of Federal Regulations
- CMS—changeable message sign
- dBA—A-weighted decibels
- DC—direct current
- DDT—Dynamic Driving Task
- EPA—Environmental Protection Agency
- ETC—electronic toll collection
- EV—electric vehicle
- FHWA—Federal Highway Administration
- FRA—Federal Railroad Administration
- ft—foot or feet
- FTA—Federal Transit Administration
- HOV—high-occupancy vehicle
- IEEE—Institute of Electrical and Electronics Engineers
- IES—Illuminating Engineering Society
- ILEV—inherently low emission vehicle
- in—inch(es)
- ISEA—International Safety Equipment Association
- ITE—Institute of Transportation Engineers
- ITS—intelligent transportation systems
- L—taper length
- LED—light-emitting diode
- LP—liquified petroleum
- LRT—light rail transit
- mi—mile(s)
- MPH or mph—miles per hour
- MUTCD—Manual on Uniform Traffic Control Devices for Streets and Highways
- N—length of one line segment plus one gap of a broken line
- NCEES—National Council of Examiners for Engineering and Surveying
- NCHRP—National Cooperative Highway Research Program
- ODD—Operational Design Domain
- OPM—U.S. Office of Personnel Management
December 2023
Sect. 1C.02 to 1C.03
