1. Short title This Act may be cited as the Collision Avoidance Systems Act of 2017 . 2. Rear-end collision avoidance systems (a) Amendment Subchapter II of chapter 301 of part A of subtitle VI of title 49, United States Code, is amended by adding at the end the following new section: 30129. Rear-end collision avoidance systems (a) Pulsating light systems allowed A passenger car, multipurpose passenger vehicle, truck, or bus may be equipped with a pulsating light system. (b) Definition As used in this section, pulsating light system means a system for a high mounted stop lamp in which— (1) when the brake of the vehicle is applied, the lamp pulses rapidly no more than four times and for no more than two seconds and then converts to a continuous light as a normal stop lamp until the time that the brake is released; and (2) the rapid pulsing described in paragraph (1) may not be repeated upon a subsequent application of the brakes for a lock-out period of at least five seconds after the release of the brake described in paragraph (1). . (b) Revision to Code of Federal Regulations Not later than 180 days after the date of enactment of this Act, the Secretary of Transportation shall update the entry for high mounted stop lamp in Table 1–a of section 571.108 of title 49, Code of Federal Regulations, in accordance with the amendment made by subsection (a). (c) Technical and conforming amendment The table of sections for subchapter II of chapter 301 of part A of subtitle VI of title 49, United States Code, is amended by adding at the end the following new item: 30129. Rear-end collision avoidance systems. .