|FHWA > Design > 4/15/09 Memo: Coordination of Vertical Clearance Design Exceptions on the Interstate System|
The Federal Highway Administration (FHWA) and the Military Traffic Command Transportation Engineering Agency (MTMCTEA) of the Department of Defense have cooperated to meet the demands of the military traffic on the Interstate System, particularly in the area of vertical clearance. On January 1, 2004, MTMCTEA changed its name to the Surface Deployment and Distribution Command Transportation Agency (SDDCTEA). The SDDCTEA has also relocated from Virginia to Scott Air Force Base, Illinois. These changes have necessitated a revision to the contact information for vertical clearance design exceptions.
The coordination and reporting with SDDCTEA on all design exceptions for vertical clearance is to ensure they are aware of the location of nonstandard clearances on the Interstate System in the event a defense emergency arises. The military continues to have a need for the 16-ft (4.9m) clearance. While the size of future equipment that may use the Interstate System is unknown, SDDCTEA needs to ensure options remain for the routing of military equipment.
All exceptions to the 16-ft (4.9m) vertical clearance standard on rural Interstate routes or on a single Interstate route through urban areas must be coordinated with SDDCTEA. This vertical clearance standard on the Interstate System is contained in “A Policy on Design Standards – Interstate System”, AASHTO 2005. Information on Coordination of Design Exception for Vertical Clearance on the interstate can be found at: http://www.fhwa.dot.gov/design/design_standards.cfm
All requests for coordination should contact the SDDCTEA at:
Director, Surface Deployment and Distribution Command Transportation Engineering Agency (SDDCTEA)
A format similar to the attachment may be used to provide the information necessary for coordination. Two previous FHWA memoranda from 1997 and 1999 on policy, procedures and the role in coordinating with SDDCTEA are attached.
National security has and always will be one of FHWA’s highest priorities. Accordingly, FHWA, in cooperation with the State Departments of Transportation, need to continue coordinating with SDDCTEA to achieve the vertical clearance necessary to satisfy the needs of all agencies.
To:Surface Deployment and Distribution
From: Federal Highway Administration
Interstate Vertical Clearance Exception Coordination
1. Structure Location:
(mark an “x” on the appropriate line)
2. Structure NBI number:
3. Project Description:
Estimated Total Project Cost: $
4. Location (e.g., driving lane, passing lane, shoulder, ramp, C-D Road, etc.) and description of the substandard clearance:
Aux./Ramp (Interstate to Interstate)
5. Description of work required to achieve the 4.9m (16.0 ft) clearance:
Estimated additional cost to obtain 4.9m (16.0ft) clearance: $
6. Reason why 4.9m (16.0ft) vertical clearance cannot be attained:
7. Alternate route with 4.9m (16.0ft) vertical clearance:
8. Anticipated schedule for future project(s) which will correct or improve the substandard clearance:
Future project not programmed
9. Names of nearby military installations or ports:
19 MAR 2008
E-MAIL COORDINATION FORM (INCLUDING VICINITY MAP) TO:
1. STRUCTURE LOCATION –
2. STRUCTURE NBI NUMBER – National Bridge Inventory reference number
3. PROJECT DESCRIPTION - pavement rehabilitation, pavement preservation, etc.
4. LOCATION AND DESCRIPTION OF THE SUBSTANDARD CLEARANCE - dual units of the existing and proposed clearance are preferred – Metric (meters in decimals) and English (feet and inches).
5. DESCRIPTION OF WORK REQUIRED TO ACHIEVE THE 4.9m (16.0ft) CLEARANCE – self-explanatory
6. REASON WHY 4.9m (16.0ft) VERTICAL CLEARANCE CANNOT BE ATTAINED – high cost, environmental issues, etc.
7. ALTERNATE ROUTE WITH 4.9m (16.0ft) VERTICAL CLEARANCE - alternate route around each substandard-vertical-clearance substructure. The alternate route should have standard vertical clearances. If at least one standard vertical clearance through-lane exists (in both directions), this can be considered an alternate route. A diamond interchange can provide an alternate route.
8. ANTICIPATED SCHEDULE FOR FUTURE PROJECTS WHICH WILL CORRECT OR IMPROVE THE SUBSTANDARD VERTICAL CLEARANCE – include type of project (bridge replacement, etc) and year programmed
9. NAMES OF NEARBY MILITARY INSTALLATIONS OR PORTS – self-explanatory
10. REMARKS – self-explanatory
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