; and (2) may not charge an additional or separate monetary fee, payment, or surcharge, beyond the base price of the passenger motor vehicles, for access to AM broadcast stations for the period of time described in this subsection. (d) Relationship to other laws When the rule issued under subsection (a) is in effect, a State or a political subdivision of a State may not prescribe or continue in effect a law, regulation, or other requirement applicable to access to AM broadcast stations in passenger motor vehicles. (e) Enforcement (1) Civil penalty Any person failing to comply with the rule issued under subsection (a) shall be liable to the United States Government for a civil penalty in accordance with section 30165(a)(1) of title 49, United States Code. (2) Civil action The Attorney General may bring a civil action in an appropriate district court of the United States to enjoin a violation of the rule issued under subsection (a) in accordance with section 30163 of title 49, United States Code. (f) GAO study (1) In general The Comptroller General shall conduct a comprehensive study on disseminating emergency alerts and warnings to the public. (2) Requirements The study required under paragraph (1) shall include— (A) an assessment of— (i) the role of passenger motor vehicles in IPAWS communications, including by providing access to AM broadcast stations; (ii) the advantages, effectiveness, limitations, resilience, and accessibility of existing IPAWS communication technologies, including AM broadcast stations in passenger motor vehicles; (iii) the advantages, effectiveness, limitations, resilience, and accessibility of AM broadcast stations relative to other IPAWS communication technologies in passenger motor vehicles; (iv) whether other IPAWS communication technologies are capable of ensuring the President (or a designee) can reach at least 90 percent of the population of the United States at a time of crisis, including at night