While my knowledge base doesn't contain specific documentation that consolidates all safety requirements and regulations for vehicle seat belts, I can offer comprehensive safety guidance based on industry best practices and the documents available.

Key safety requirements and regulations for vehicle seat belts focus on preventing injuries and ensuring passenger protection. These include:

• Use of Seat Belts: Operators of powered mobile equipment must use seat belts or other restraining devices while the equipment is in motion.
• Proper Maintenance: Seat belts must be maintained in serviceable condition.
• ROPS Equipped Vehicles: Vehicles equipped with Roll-Over Protective Structures (ROPS) must have seat belts installed for the operator and any other worker.
• Inspection and Replacement: Regular inspection of seat belts and immediate replacement of defective components.
• Standards Compliance: Seat belts should meet the standards set by the Society of Automotive Engineers (SAE).

Additionally, general vehicle safety includes:

• Equipping vehicles with suitable headlights and back-up lights if operated in darkness.
• Ensuring that each unit of powered mobile equipment is constructed, repaired, inspected, tested, maintained, and operated in accordance with the manufacturer's specifications or an approved standard.
• Installing a bulkhead or other effective restraining device to protect the operator and any other worker in or on powered mobile equipment that is used to transport equipment or materials, if that equipment could shift under emergency stopping conditions and endanger the operator or other worker.