Sami's Law This bill directs the Department of Transportation to withhold specified graduated percentages of a state's apportionment of certain federal-aid highway funds if the state has not enacted and is not enforcing certain transportation network company (TNC) vehicle identification laws. A "transportation network company" is an entity that uses a digital network to connect riders to drivers affiliated with the entity to transport the rider using a vehicle owned, leased, or otherwise authorized for use by the driver to a point chosen by the rider. States must require TNC drivers to display (1) a front and rear license plate; (2) a scannable quick response or similar code on the windows for riders to verify that they are entering the correct authorized vehicle; and (3) illuminated signs that are visible in both day and night, and readable from fifty feet. Drivers must also get periodic safety inspections of their ride-hailing vehicle. The bill prohibits the sale of illuminated TNC vehicle signs by any person other than a transportation network company and the display of such signs by individuals who are not authorized drivers.