SimpleNoiseBarrier

Attachment

The attachment point is at the inside edge of the barrier, which is typically at the outside edge-of-traveled way or shoulder or another road element.

Input Parameters

Note: All dimensions are in meters or feet unless otherwise noted. All slopes are in run-over-rise form (for example, 4 : 1), unless indicated as a percent slope with a “%” sign.

Parameter	Description	Type	Default
Side	Specifes to insert the subassembly either on the right or the left side of the attachment point.	Left/Right	Right
Top Width	Width of the top barrier top.	Numeric, Positive	1.0m 3.0 ft
Foreslope	Default slope of the barrier foreslope link.	Numeric	1:1.5
Backslope	Default slope of the barrier back slope link.	Numeric	1:1.5
Height	Specifies height of the barrier measure from the attachment point elevation.	Numeric, Positive	3.00m 9.00ft
Topsoil Thickness	Specifies depth of material lining along daylight link. If a value of zero is entered, then no lining material is added.	Numeric, positive	0.0
Topsoil Shape Code	Specifies shape code for the topsoil material	String	Topsoil

Target Parameters

This section lists the parameters in this subassembly that can be mapped to one or more target objects, such as a surface, alignment, or profile object in a drawing. For more information, see To Specify Corridor Targets.

Parameter	Description	Status
Target Surface	Can be used to tie in the back of the barrier into an existing surface at the user defined slope. The following object types can be used as targets for specifying this surfaces: surfaces.	Optional

Output Parameters

Parameter	Description	Type
Barrier Top Elevation	Elevation of the mid point of the barrier top link	Numeric
Barrier Top Offset	Offset of the mid point of the barrier top link	Numeric
Topsoil Thickness	Thickness of topsoil material	Numeric
Backslope	Slope of the noise barrier backslope link	Numeric
Barrier End Offset	Offset of the end point of the noise barrier.	Numeric
Barrier End Elevation	Elevation of the end point of the noise barrier	Numeric

Behavior

This noise barrier is introduced from the attachment point with the foreslope and backslope as specified by the user. If the Top width is set to zero value, then a triangular shaped noise barrier results. Further if a topsoil layer is selected for this subassembly – then a lined material layer is introduced as illustrated below. (Note: a horizontal link at the attachment point is introduced such that the thickness of the material is equal to the specified value).

If the backslope is tied into a surface, then that side height is adjusted to daylight into the surface as shown below.

If the backslope is not tied into any surface, then the height of that side is set with specified height. Further, if the surface at that point is higher than the top of the barrier then again backslope link is drawn downwards with specified slope and height parameters.

Layout Mode Operation

In layout mode, this subassembly draws the links showing the default parameters, including height for back slope.

Point, Link, and Shape Codes

The following table lists the point, link, and shape codes for this subassembly that have codes assigned to them. Point, link, or shape codes for this subassembly that do not have codes assigned are not included in this table.

Type	Codes	Description
P2	RW_Top	Top point of the barrier
P3	RW_Outside	Subbase daylight point
P3	Daylight	Only if Target Surface is set
P4	Bench_In	Inside edge of the barrier top (only if Top Width is non-zero value)
P5	Bench_Out	Outside edge of the barrier top (only if Top Width is non-zero value)
L1, L2,L3	Top	Finish grade of the shoulder
L1, L2,L3	Datum	Only if the topsoil is thickness is set to zero
L4 to L7	Datum	Only if the topsoil thickness is set to Positive value
L8	Datum	Only if Target Surface is not set
S1	User Defined Code	User defined code for topsoil (default - Topsoil)