To amend title 23, United States Code, to require periodic testing of the competency of drivers over age 79, and for other purposes.

Requires the Secretary of Transportation to withhold specified apportionments of Federal-aid highway funds (five percent for FY 2006 and ten percent for each fiscal year thereafter under the National Highway System component, the surface transportation program, and Interstate maintenance component) from a State that fails to comply with the requirement that any individual over age 79 successfully complete a test to determine competency to operate a motor vehicle as a condition receiving or renewing a driver's license.