23 C.F.R. § 1300.27
(b) Definitions. As used in this section—
Digital alert technology means a system that provides electronic notification to drivers.
Optical visibility measure means an action to ensure that items are seen using visible light.
Public information campaign means activities to build awareness with the motoring public of a traffic safety issue through media, messaging, and an organized set of communication tactics that may include but are not limited to advertising in print, internet, social media, radio and television.
(c) Qualification criteria. To qualify for a grant under this section in a fiscal year, a State shall submit a plan that describes the method by which the State will use grant funds in accordance with paragraph (e) of this section. At a minimum, the plan shall state the eligible use(s) selected, consistent with paragraph (e) of this section, and include—
(e) Use of grant funds. A State may only use grant funds awarded under 23 U.S.C. 405(h) as follows:
(1) To purchase and deploy digital alert technology that—