Mega Structure 2 - Chesapeake Bay Bridge Tunnel

For over 50 years, the Chesapeake Bay Bridge-Tunnel has captured worldwide attention as a modern engineering wonder and an important East Coast travel convenience. Crossing over and under open waters where the Chesapeake Bay meets the Atlantic Ocean, the Bridge-Tunnel provides a direct link between Southeastern Virginia and the Delmarva Peninsula (Delaware plus the Eastern Shore counties in Maryland and Virginia), and cuts 95 miles from the journey between Virginia Beach and points north of Wilmington, Delaware. Following its opening on April 15, 1964, the Bridge-Tunnel was selected "One of the Seven Engineering Wonders of the Modern World" in a worldwide competition that included more than one hundred major projects. In addition, in 1965, it was distinguished as "The Outstanding Civil Engineering Achievement" by the American Society of Civil Engineers. To date, over 116 million commercial and passenger vehicles have crossed the Bridge-Tunnel. In order to meet future traffic demands and provide for a safer crossing, construction of a parallel crossing project began in summer 1995, and opened to four-lane traffic on April 19, 1999. No less challenging than construction of the original span, this project once again drew focus to a remarkable achievement in engineering and construction.

From the early 1930's to 1954, a private corporation managed scheduled ferry service between Virginia's Eastern Shore and the Norfolk/Virginia Beach area. With the number of ships (including the number of passengers and vehicles they transported) increasing steadily, the Virginia General Assembly stepped in to create the Chesapeake Bay Ferry District and the Chesapeake Bay Ferry Commission as the governing body of the District; subsequently the Chesapeake Bay Bridge and Tunnel District and Commission. 

Copy in AutoCAD

This command is Applicable to AutoCAD_2016, AutoCAD_Architecture_2016, AutoCAD_Civil 3D_2016, AutoCAD_Electrical_2016, AutoCAD MEP_2016, AutoCAD Map 3D _2016, AutoCAD Mechanical_2016, AutoCAD P&ID_2016, AutoCAD Plant 3D_2016, AutoCAD Structural Detailing_2016, and AutoCAD Utility Design_2016.
AutoCAD COPY Command Copies the object at a specified distance in a specified given direction.
 look for this icon in Modify toolbar or 


CO Enter in Command Line
With the [COPYMODE] system variable, you may control whether to create multiple number of copies of the object automatically.
AutoCAD COPY Command COPY Command AutoCAD COPY Command GUID 7A9EC2F4 4552 491C BED9 EA8C1CED533F
The following are asked in the command line after initiating the Command :
Select object to copy:  select the specified object to copy and then press [Enter]
Specify basepoint or <Displacement/mOde/Multiple> : Specify a basepoint i.e. base point is the point considered for the reference vector displacement  or enter any one of these options Displacement or mode or Multiple.
Specify 2nd point or [Array] [use 1st point as displacement]: Specify a 2nd point or displacement or enter the available option.

Displacement_

Specify a relative distances and directions using coordinate or cross hair .
The two point you specified defines a vector that indicate how far from original the copied object are placed and in which directions.
If you press [Enter] at the Specified Second Point , the 1st point is interpreted as relative to X,Y,Z displacements. For example, if you specify 3,4 for the basepoint and press [Enter]at the next step, the object is copied 2 unit in the direction and 3 unit in the Ydirection from their previous location.

Draft Settings in AutoCAD (3D Object Snap)

3-D Object_Snap setting controls the dynamic object_snap settings for 3-D object.

With dynamic 3-D Object_Snap setting, also called Osnap setting, you may signify the snap point at the specified position on the objects. When more than one option are choosen, the choosen snap mode is applied to give a point closer to_center of  aperture_box. Press TAB to jump on the option.
List of available Option
3-D Object_Snap [On/off]
It Turn 3-D Object_Snap on and off. The 3-D Object_Snap selected under 3D Object_Snap Mode is active while Object_Snap is on. [3DOSMODE system variable]
Object_Snap Mode
Lists the 3D Object_Snap mode.
Vertex_
It Snap to closer vertex of a 3-D objects.


Drafting Settings in AutoCAD (Dynamic Input)


Drafting Settings (Dynamic Input) command is Applicable to AutoCAD_2016, AutoCAD_Architecture_2016, AutoCAD_Civil 3D_2016, AutoCAD_Electrical_2016, AutoCAD MEP_2016, AutoCAD Map 3D _2016, AutoCAD Mechanical_2016, AutoCAD P&ID_2016, AutoCAD Plant 3D_2016, AutoCAD Structural Detailing_2016, and AutoCAD Utility Design_2016.

List of Available Option in Drafting Settings (Dynamic Input) 
Enable Pointer_Input
Turn on pointer_input. When pointer_input and dimensional_input are turned on, dimensional_input supersede pointer_input when available. [DYNMODE system variable]
Pointer_Input
Display locations of cross hair as coordinates value in a tool-tip near the cross hair. When command prompt you for points, you may enter coordinates value in the tool-tip instead of in Command_window.
Preview Area_
Show examples of pointer inputs.
Settings_
Display Pointer_Input Setting box.
Enable Dimension_Input
Turn on dimensional_input. Dimensional_input not available for some command that prompts for 2nd point. [DYNMODE system variable]