ABBREVIATION AND ACRONYM

NOMENCLATURE		CIRCLE of RELATIVITY
B	Bridge Projects (B-1234)	TIP Projects
BEG	Begin	Roadway Plans
BIC	Buried in Cut	Roadway Plans
BK	Back	Roadway Plans
BL	Base Line	Base Mapping
BM	Bench Mark	Roadway Profiles
BRG	Bridge	Roadway Plans
BS	Backsight	Geodetic Survey
BST	Bituminous Surface Treatment	Pavement Schedule
BW	Barrier Wall or Barbed Wire (Fence)	Roadway Plans

DEFINITION

back - derivations"BK." A complimentary term used in conjunction with the term ahead" to label station equations. The back station signifies the stations behind the equality on a chain: -L- Sta 11+23.34 BK = -LREV- Sta 25+62.31 AH. base course - Pavement Layer between the surface course or intermediate course layer and the subgrade (fine grade and compacted soil). Common base course: SP B25.0B and ABC.[image] beam - synonym: girder. Steel or concrete superstructure members placed length    wise along a bridge. Generally located between the bridge concrete slab    and bent cap. Span types: Prestressed Cored Slab, Prestressed Girder,    Prestressed MBT, Prestressed Box Beam, I-Beam, and Plate Girder.[image] bearing - Angle measurement used to label direction for horizontal alignments.  Format: {North or South} {Angle in Degrees° Minutes' Seconds" from  Respective N or S Axis}{East or West}; [examples: N 58° 36' 55.4" E   S 45° 22' 38.7" W]. For English projects, the accuracy of bearings is to the tenth of a second; N 11° 22' 33.4" E. For Metric projects, it is to the hundredth of a second; N 11° 22' 33.44' E. Due North is N 0° E or W; Due South is S 0° E or W; Due East is N or S 90° E;  Due West is N or S 90° W. bent - type: interior and end bents. Bridge substructure composed of bent caps, columns, piles, and footings.[image] binder course - synonym: intermediate course. Pavement Layer between the surface course layer and the base course layer.[image] bridge - synonym: structure. A structure 20 ft or more constructed to span over roadways, other bridges (flyovers), streams, wetlands, railroads, or any condition which requires a grade separation.. Other types: Cored slab: Cored slab bridges are noted because the bridge slab spans are cored or hollowed out.[image] broken back curves ƒ3- synonym: flat back curves. The arrangement of two curves with a short tangent deflecting in the same direction. During night time driving or limited sight distance conditions, drivers normally do not expect successive turns in the same direction.Use of compound curves or a spiral transition is recommended in place of broken back curves.