MUTCD: The South Dakota Department of Transportation has adopted the Millennium Edition of the Manual on Uniform Traffic Control Devices (MUTCD) as the official manual for traffic control.
NCHRP 350: Traffic Control Devices in Work Zones must be crashworthy in accordance with the National Cooperative Highway Research Program (NCHRP) 350 for each of the following categories and effective the dates shown:
Category I: All devices must be compliant.
Category II: All devices placed into service prior to October 1, 2000 will be allowed until October 1, 2002. All devices placed into service after October 1, 2000 must be compliant.
Category III: Portable Sign Trailers used after January 1, 2003 must be compliant. All other Category III devices placed into service prior to October 1, 2002 will be allowed until October 1, 2007.
A listing of FHWA approved devices in these categories and additional information on NCHRP 350 can be found at the FHWA NCHRP 350 Internet Site
Effective November 28, 2008 - all workers within the right of way who are exposed either to traffic (vehicles using the highway for purposes of travel) or to construction equipment within the work area shall wear high-visibility safety apparel intended to provide conspicuity during both daytime and nighttime usage, and meeting the Performance Class 2 or 3 requirements of the ANSI/ISEA 107-2004 publication entitled "American National Standard for High-Visibility Safety Apparel and Headwear". This applies to all projects subject to the provisions of the SDDOT Standard Specifications and all other work performed along federal-aid highways. The safety apparel shall be of fluorescent red, fluorescent orange-red, or fluorescent yellow-green and include reflectorized material as specified in the ANSI/ISEA publication. Items which comply with the requirements should be noted as such on the garment tags. The link below is the rule. The files illustrate the requirements of the various garment classes. Federal Registry
ANSI/ISEA 107-2004 GARMENT CLASS REQUIREMENTS