STATE OF TENNESSEE

DEPARTMENT OF TRANSPORTATION

( ) -

JOHN C. SCHROER	BILL HASLAM

COMMISSIONER	GOVERNOR

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SUBJECT:	DESIGN EXCEPTION REQUEST AND JUSTIFICATION

Project No.
PIN No.
Project Description:
NHS	YES NO
State Route	YES NO

DESIGN CONTROLLING CRITERIA FOR WHICH EXCEPTION IS REQUESTED:

APPLICABLE FOR ALL NHS ROADWAYS

Design Speed	Design Loading Structural Capacity

APPLICABLE FOR NHS ROADWAYS WITH DESIGN SPEED ≥ 50 MPH

Lane Width	Cross Slopes

Horizontal Curve Radius	Vertical Clearance

Stopping Sight Distance	Superelevation Rate

Shoulder Width	Maximum Grade

DESCRIBE THE REASONING OF THE DESIGN EXCEPTION REQUEST:

PROJECT DESIGN DATA:

Highway Functional Classification: (Green Book 2011 Section 1.3)	Principal Arterial Arterial	Collector Local Road
Rural or Urban area:
Roadway Design Standard Drawing:
Existing Design Speed: Existing Posted Speed:
Proposed Design Speed: Proposed Posted Speed:
Type of Terrain:	Level Rolling Mountainous
Traffic Data:	ADT (20 ):	D:
ADT (20 ):	T:
DHV:	V:

GEOMETRIC DESIGN DATA FOR Location of the requested DESIGN EXCEPTION:

Standard Existing Proposed N/A

Cross Slope (tangent section):
Max. Superelevation Rate:
Minimum Radius of Curve:
Minimum Stopping Sight Distance:
Passing Sight Distance:
Crest Vertical Curve “K”:
Sag Vertical Curve K:
Maximum Grade:
Design Loading:

ROADWAY TYPICAL SECTION

Lane Width:
Outside Shoulder width:
Inside Shoulder width:
Clear Zone width:

BRIDGE DESIGN FEATURES

Traffic Lane Widths:
Outside Shoulder Widths:
Inside Shoulder Widths:
Sufficiency Rating:
Vertical Clearance
To Navigational Waterway:
To Other Highway:
To Railroad:

OTHER FACTORS CONSIDERED FOR THE EXCEPTION REQUEST:

YES	NO	N/A
SAFETY
Accident history data has been reviewed.
All roadway and roadside safety mitigation measures have been considered and provided.
The proposed variance from the minimum roadway design standards does not adversely affect the safety of the facility.
The Highway Safety Manual is used to justify the design exception.
OPERATIONS
The operation of the proposed typical cross-section is comparable with operation of the adjacent cross-sections.
The proposed design does not cause a reduction in capacity or adversely affect traffic flow of the facility.
The proposed design does not adversely effect long-term operations.
ROADWAY DESIGN
It is not feasible to meet the minimum roadway design standards due to right-of-way restrictions, environmental impacts, etc.
The proposed design maintains the same level of service compared to the design based on minimum roadway design standards.
The proposed design results in a significant cost savings compared to the design based on minimum roadway design standards.
The proposed design can meet minimum roadway design standards in the future.

JUSTIFICATION OF DESIGN EXCEPTION:

Please provide detailed justification for the each item checked NO above

Attachments

DESIGN EXCEPTION IS REVIEWED AND RECOMMENDED

FOR APPROVAL BY:

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Date

Reviewer Comments Attached

APPROVED BY:

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Date