Motor Carrier Safety Assistance Program Reauthorization Act of 1991

Motor Carrier Safety Assistance Program Reauthorization Act of 1991 - Amends Federal law to authorize the Secretary of Transportation (Secretary) to make grants to States for the development of programs for the enforcement of Federal and State commercial motor vehicle safety laws and standards.

Requires the Secretary to formulate procedures for the submission of State plans enforcing such laws and standards. Sets forth specified plan requirements.

Provides that the Federal share of costs for such programs shall not exceed 80 percent of such costs.

Makes funds available for such grants out of the Highway Trust Fund.

Amends the Surface Transportation Assistance Act of 1982 to authorize the reimbursement of costs in enforcing State commercial motor vehicle safety laws and standards to States with approved plans.

Authorizes appropriations.

Directs the Secretary to develop an improved formula for the allocation among States of Motor Carrier Safety Assistance Program funds.

Amends the Commercial Motor Vehicle Safety Act of 1986 to require the Secretary to issue regulations establishing penalties for violations of out-of-service orders by commercial motor vehicle operators. Sets forth specified requirements.

Requires the Secretary to submit to specified congressional committees a report on the effectiveness of: (1) Commercial Vehicle Safety Alliance; and (2) the uniform financial penalty recommendations of the Alliance.

Directs the Secretary to issue regulations specifying tolerance standards for ensuring compatibility of intrastate commercial motor vehicle safety laws under the Motor Carrier Safety Assistance Program.

Requires the Secretary to consult with law enforcement organizations and affected industries to develop a model program for Program officers to enforce the .04 per centum blood alcohol concentration limit pursuant to the Commercial Motor Vehicle Safety Act of 1986.

Directs the Secretary to add two additional positions at the headquarters of the Federal Highway Administration.

Drug Free Truck Stop Act - Amends the Controlled Substances Act to impose mandatory minimum criminal penalties for the unlawful distribution or possession of controlled substances within 1,000 feet of a truck stop or safety rest area. Prohibits the suspension of a sentence, granting of probation, or eligibility for parole until the individual has served the minimum required sentence under the Federal criminal code for any person who violates this Act after a prior conviction under this Act has become final.

Requires the U.S. Sentencing Commission to promulgate specified sentencing guidelines for violations of this Act. Bars multiple enhancements.

Amends the Truck and Bus Safety and Regulatory Reform Act of 1988 to require the Secretary to initiate a rulemaking proceeding to adopt methods for improving braking performance standards for commercial motor vehicles.

Requires the Secretary to give a high priority for safety, compliance, and other inspection or audit reviews to any motor carrier whose drivers demonstrate a serious pattern of violating State, local, or commercial motor vehicle safety laws, regulations, or standards.