Special details are engineering drawings that are frequently draft versions of Standard Plans in the approval process. Once Department Administrators and the FHWA approve a special detail, it becomes a Standard Plan. The Design Standards Unit also produces special details of experimental items that may or may not become Standard Plans and of items that have a special limited use. Most special details that have a special limited use are eventually dropped when all the conditions they were specifically designed for have been met. Current applicable special details are listed on the note sheet of a set of construction plans and are also physically attached to those plans.
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The special details in 11" x 17" pdf format are intended for inclusion in a set of construction plans. Consultants doing business with MDOT may contact their Project Manager to obtain special details.