File Name: shld01.cri, shld02.cri ...

Reference Standard No. : 560.01, 560.02

Required Definition Files: standard

Summary

The shoulder criteria is designed for drawing shoulders which adhere as close as possible to North Carolina Standards.

The configuration of the finished shoulder is controlled by several factors including pavement slope, paved shoulder width and unpaved shoulder width. The standard maximum 'roll-over' (0.06) is utilized where applicable. The point at which the roll-over is applied depends on the paved and unpaved shoulder widths defined by the designer. For more detailed information on shoulder configurations, see Roadway Standard Drawings Manual.

Typical shoulder widths are specified by the designer as the usable fill shoulder width, the usable cut shoulder width and the paved shoulder widths.

If the cut and fill width are not the same, the fill shoulder width should be more than the cut shoulder width. The shoulder criteria will draw the shoulder to the cut width only, since it has no way of 'knowing' whether a section will be cut or fill. The fill shoulder will be extended to it's full width later by other criteria types such as standard slope criteria.

Shoulder widths can also be defined by using a plan view DGN element (typically guardrail). See variable definitions below for "SET WIDTH BY DGN ELEMENT" for details.

Note: There is currently no standard or policy in place that requires different widths for cut and fill shoulders. This feature is a left-over from old standards, but remains in place within the criteria. Why? Because standards and policies change .... constantly, and have an uncanny tendency to revert back to abandoned ideas on a regular basis.

Shoulder Borrow Quantity Feature

The criteria will always draw the pavement edge slopes. These slope elements are placed on level 14 as specified by the default value of global variable "PAVEMENT SLOPE LEVEL". Shoulder Borrow quantities can therefore be computed using earthworks.

In order for the pavement edge slope elements to be drawn accurately, the global variables "BITUMINOUS DEPTH" and "AGGREGATE DEPTH" (or local variables "TM* BITUMINOUS DEPTH" and "TM* AGGREGATE DEPTH") must be properly defined. See documentation of TMPLT criteria for more details on these variables.

Inclusion Sequence

Shoulder criteria should be included only after tmplt criteria.

User Defined Variables

"SH01 WIDTH"

Define as the total width of the shoulder.

"SH01 WIDTH CUT"

Define as the desired usable width of the shoulder in a cut section. This variable is defined, by default, to the same value as "SH01 WIDTH".

"SH01 WIDTH FILL"

Define as the desired usable width of the shoulder in a fill section. This variable is defined, by default, to the same value as "SH01 WIDTH".

"SH01 SET WIDTH BY DGN ELEMENT" When defined as non-zero, this variable causes the criteria to check for presence of shoulder point elements as defined by "SHOULDER WIDTH ELEMENT". If found, the width of the shoulder is set to the horizontal location of that element. Definitions of "SH01 WIDTH", "SH01 WIDTH" and "SH01 WIDTH" are ignored.

"SHOULDER WIDTH ELEMENT" This variable is defined via a DEFINE_DGN statement, and specifies the symbology of elements in a plan view DGN file that represent the desired shoulder point.

"SH01 SLOPE"

The slope variable is not necessary in this version of the criteria library, but is supported for compatibility with older input files.

"SH01 PAVED"

Define the desired width of paved shoulder. Widths of 0, 2.0, 4.0 and 10.0 are expected but not required. (Corresponding widths in meters: 0.6, 1.2 and 3.0).

"SH01 PARTIAL DEPTH" New!

When defined as non-zero, this variable enable shoulder rollover slopes according to 2006 STD 560.02, sheet 3 of 5 (Case 7), for rollover slopes on partial depth paved shoulders. This variable is used in conjunction with the "SH01 PAVED" variable set to 10 Ft (3 M). Only graded shoulder sections ("SH01 SECTION" 0 ) are permitted. Normal shoulder slope ("SH01 SLOPE") is fixed at 0.04 Ft/Ft (M/M). Designers definitions for variable "SH01 SLOPE" and "SH01 SECTION" are ignored. Default is 0.

Example:

DEFINE "SH01 PAVED" 10
DEFINE "SH01 PARTIAL DEPTH" 1