of contract authorization) (limitation on obligations) (highway trust fund) For payment of obligations incurred in the implementation, execution, and administration of motor carrier safety operations and programs pursuant to section 31110 of title 49, United States Code, as amended by the Fixing America's Surface Transportation Act or any successor surface transportation reauthorization Act authorizing appropriations for fiscal year 2021, $379,500,000, to be derived from the Highway Trust Fund (other than the Mass Transit Account), together with advances and reimbursements received by the Federal Motor Carrier Safety Administration, the sum of which shall remain available until expended: Provided , That funds available for implementation, execution, or administration of motor carrier safety operations and programs authorized under title 49, United States Code, shall not exceed total obligations of $379,500,000 for “Motor Carrier Safety Operations and Programs” for fiscal year 2021, of which not less than $85,000,000, to remain available for obligation until September 30, 2023, is for the development, modernization, and enhancement of information technology and information management systems and for the continuing operation of and maintenance of such systems: Provided further, That not less than $13,073,000, to remain available for obligation until September 30, 2023, is for the research and technology program, of which not less than $3,300,000 shall be available to begin the Large Truck Crash Causal Factors study: Provided further, That $20,000,000 for carrying out activities under this heading, including the modernization and maintenance of border facilities, is to remain available for obligation until September 30, 2025. Motor carrier safety grants (liquidation of contract authorization) (limitation on obligations) (highway trust fund) For payment of obligations incurred in carrying out sections 31102, 31103, 31104, and 31313 of title 49, United States Code, as amended by the Fixing America's Surface