1. Short title This Act may be cited as the Collision Avoidance Systems Act of 2023 . 2. Rear-end collision avoidance systems (a) Clarification on pulsating light systems Beginning on the date of enactment of this Act, Standard 108 shall be deemed to allow for the use of pulsating light system on vehicles covered by such Standard. (b) Rulemaking Not later than 180 days after the date of enactment of this Act, the Secretary of Transportation shall issue such regulations as are necessary to update Standard 108 to— (1) include performance-based standards for pulsating light systems; and (2) allow for the use on motor vehicles of such systems. (c) Definitions In this section: (1) Pulsating light system The term pulsating light system means a system for a high-mounted stop lamp in which— (A) when the brake of the vehicle is applied, the lamp pulses rapidly no more than 4 times and for no more than 1.2 seconds, after which such lamp converts to a continuous light as a normal stop lamp until the time such brake is released; and (B) the pulses described in subparagraph (A) may not repeat upon a subsequent application of the brake of the vehicle for a lock-out period of at least 5 seconds after the release of the brake described in subparagraph (A). (2) Standard 108 The term Standard 108 means Federal Motor Vehicle Safety Standard Number 108, contained in section 571.108 of title 49, Code of Federal Regulations.