Protecting America's Roads Act or PARA - Prohibits the Secretary of Transportation (DOT), unless expressly authorized by Congress, from granting authority to Mexico-domiciled motor carriers to operate beyond U.S. municipalities and commercial zones on the U.S.-Mexico border except under a pilot program meeting certain requirements, including that: (1) it not exceed a period of three years, (2) it be carried out for period sufficient to generate statistically valid findings on the safety impacts of the pilot program, and (3) certain other program requirements are met.