ABBREVIATION AND ACRONYM

NOMENCLATURE		CIRCLE of RELATIVITY
AASHTO	American Association of State Highway and Transportation Officials	Roadway Design References
ABAND	Abandoned	Right of Way Plans
ABC	Aggregate Base Course	Pavement Schedule
AC	Acre	Right of Way Plans
ACBC	Asphalt Concrete Base Course	Pavement Schedule
ACIC	Asphalt Concrete Intermediate Course	Pavement Schedule
ACS	Auxiliary Coordinate System	Microstation Attribute
ACSC	Asphalt Concrete Surface Course	Pavement Schedule
AD	Arterial Design Side Slope	Criteria
ADT	Average Daily Traffic	Traffic Diagram
AEC	Areas of Enviromental Concern	Coastal Permits
AH	Ahead	Roadway Plans
AP or APPR	Approach	Roadway Plans
ASPH	Asphalt	Roadway Plans
AST	Asphalt Surface Treatment	Pavement Schedule
AT-1	Anchor Terminal	Roadway Plans
AZ	Azimuth	Angle System

DEFINITION

ahead - derivations AH. A complimentary term used in conjunction with the term "back" to label station equations. The ahead station signifies the station forward on the chain: -L- Sta 11+23.34 BK = -LREV- Sta 25+62.31 AH. arterial- Functional classification of roadway that is between an Interstate highway and Local collector.[image] at grade intersection - Intersection where all proposed grades tie or projected to a common elevation. Conversely: grade separations (bridges) are required when the intersection is not at grade. average daily traffic (ADT) - The average daily traffic on a roadway. Most Designers will label the current year ADT and the forecasted design year (usually 20 years from the construction year) ADT on a set of Roadway plans. ADT's is also one of the major criteria used used by Roadway Designers in the determining the dimensions and function of proposed roadways: relative formula [ADT = DHV/D].