1. (a) Bridge projects constructed with state bridge aid shall be designed in accordance with the following design standards and manuals:

   1. (1) AASHTO Load Resistance Factor Rating (LRFD) Bridge Design, 7th Edition (2014) with current interim revisions;
   2. (2) AASHTO Manual for Bridge Evaluation, 2nd Edition (2010), with interim revisions;
   3. (3) AASHTO Guide Specifications for Seismic Isolation Design, 4th Edition;
   4. (4) AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, 6th Edition (2013) and interim revisions;
   5. (5) AASHTO Policy on Geometric Design of Highways and Streets (2011, 6th Edition);
   6. (6) Federal Highway Administration Manual on Uniform Traffic Control Devices, as adopted by the commissioner as a policy for traffic control standards (2009 and subsequent revisions);
   7. (7) AASHTO Roadside Design Guide, 4th Edition (2011);
   8. (8) New Hampshire Department of Transportation (NHDOT) Standard Specifications for Road and Bridge Construction, 2010 Edition;
   9. (9) New Hampshire Department of Transportation (NHDOT) Highway Design Manual (1999); and
   10. (10) New Hampshire Department of Transportation (NHDOT) Bridge Design Manual (January 2015 – v 2.0).
2. (b) Bridge projects constructed with state bridge aid shall be designed in accordance with the AASHTO LRFD Bridge Design Specifications, 7th Edition (2014).

3. (c) Upon written application of a municipality, the department shall waive any of the minimum design standards:

   1. (1) Unless it determines that granting the requested waiver would result in:

      1. a. An imminent or substantial threat to human health, public safety, or the environment; or

      2. b. The design or construction of a bridge structure that has a carrying capacity of less than:

         1. 1. 15 tons for a rehabilitated bridge; or
         2. 2. The legal load permitted by RSA 266:18-b for a new bridge; and
   2. (2) If the municipality has accepted, in writing, responsibility for construction that does not meet the waived minimum design standards.

Source. #8923, eff 6-27-07; ss by #11037, eff 2-22-16