This is an informational notice that the Federal Highway Administration has new regulations, 23 CFR 634, which require the use of reflective vests for emergency personnel working in a “right of way of a federally-aided highway.”
These regulations become effective next week, on November 24, 2008. Here is a link to the federal regulations and guidance: Federal Highway Administration new regulations
The guidance also contains contact information of who to call at the Federal Highway Administration if you have any questions. Because this is a federal requirement, and not a state requirement, the Federal Highway Administration is the authority for information about this requirement.