2 Del. Admin. Code § 1.9
This Manual includes references to guidelines and design standards that have been researched, compiled, published and maintained through the efforts of nationally recognized professional organizations and publications. Any direct references to or insertion of specific portions of such guidelines or standards may generally be considered as minimum criteria or standards within the authority of this Manual. Any general references to such guidelines or standards in their entirety may generally be considered as guidance materials, (to be considered during design and construction), within the context of this Manual. The Department may exercise engineering judgement in some cases and rely on standards and criteria, (for transportation elements, streets and highways under its jurisdiction), that differ from the minimum criteria presented within this Manual or within the external guidelines and design standards referenced by this Manual.
Department standards, criteria, and manuals should be taken into consideration when planning for the design, drafting and submission of projects that abut or have an impact on the local transportation system, state highway system or the national highway system. Users of this Manual are cautioned that the strict application of exact numerical values, conditions or use information taken from portions of the text may not be appropriate for all circumstances. Individual references to design values or concepts should not be used out of context or without supporting engineering judgment.
The following guidelines and design standards (which are made available in their entirety through nationally recognized professional organizations and publications) are incorporated by reference, except as modified within this Manual. In the event that conflicts may exist between incorporated references and this Manual, the Development Coordination Manual controls.
AASHTO's "Guide for the Development of Bicycle Facilities", 4th Edition (2012)
AASHTO's "A Policy on Geometric Design of Highways and Streets", 7th Edition (2018), commonly referred to as "the Green Book"
AASHTO's "LRFD (Load and Resistance Factor Design) Bridge Design Specifications", 6th Edition (with 2013 Interim Revisions)
AASHTO's "Roadside Design Guide", 4th Edition (2011)
AASHTO's "Manual for Assessing Safety Hardware (MASH)", 1st Edition (2009)
American Concrete Pipe Association (ACPA)'s "Concrete Pipe And Box Culvert Installation Manual", (2007)
ACPA's "Concrete Pipe Design Manual", (2009)
Institute of Transportation Engineers (ITE)'s "Trip Generation Manual", 10th Edition (2017)
McTrans' "Highway Capacity Software (HCS7)", (2017)
Transportation Research Board (TRB)'s "Highway Capacity Manual (HCM)", 6th edition (2016)
TRB's "NCHRP (National Cooperative Highway Research Program) Report 350 -Recommended Procedures for the Safety Performance Evaluation of Highway Features", (1993)
The following guidelines, design standards and/or independent manuals (which are made available in their entirety through their authoring Agencies and/or Departments of the State of Delaware) are incorporated by reference, except as modified within this Manual. In the event that conflicts may exist between incorporated references and this Manual, the Development Coordination Manual controls.
DelDOT's "Pedestrian Accessibility Standards for Facilities in the Public Right-of-way" (2018 as amended)
DelDOT's "Road Design Manual" (2011 as amended)
DelDOT's "Standard Construction Details" (2017 as amended)
DelDOT's "Standard Specifications for Road and Bridge Construction" (2016 as amended)
DelDOT's "Bridge Design Manual" (2017 as amended)
DelDOT's "Traffic Design Manual" (2015 as amended)
DelDOT's "Traffic Calming Manual" (2012 as amended)
Regulations that are adopted through the Federal or State of Delaware Register of Regulations shall be taken into consideration in each aspect of planning, design or construction, where such Regulations may have independent jurisdiction over applicable elements irrespective of any consideration in this Manual. The omission of explicit references to any such applicable State or Federal Regulation from this Manual shall not have the effect of sheltering the design professional from the separate and/or additional responsibilities that such Regulations may create. In the event that conflicts may exist between State or Federal Regulation and this Manual, the more restrictive criteria should be used, while meeting the intent of the controlling Regulation. All Regulations shall be considered in their entirety, inclusive of any amendments, in their most current version.
The following is not an exhaustive list, but includes some of the more commonly referenced Regulations:
Delaware version of the "Federal Manual on Uniform Traffic Control Devices (DE-MUTCD) (2011 as amended or current version)
Delaware Code, Section 2308: Development Related Improvements Requiring New Rights-of-way (2006)
U.S. DOT Federal Transit Administration (ADA) American with Disabilities Act (2006 - Federal Register, Vol. 71, No. 209 as amended or current version)
U.S. DOJ American with Disabilities Act (ADA) Standards for Accessible Design (2010 -Federal Register Vol. 75, No.178 as amended or current version)
2 Del. Admin. Code § 1.9