Road Traffic Act (Chapter 276): Primary legislation governing vehicle ownership, transfer, registration and control requirements in Singapore. Essential for establishing legal authority over vehicle possession.

Consumer Protection (Fair Trading) Act: Legislation protecting consumers in vehicle-related transactions and providing safeguards against unfair practices in the automotive sector.

Motor Vehicles (Third-Party Risks and Compensation) Act: Law governing vehicle insurance requirements and liability considerations for vehicle ownership and operation in Singapore.

Personal Data Protection Act 2012 (PDPA): Legislation governing the handling of personal information and consent requirements for data sharing in authorization documents.

Electronic Transactions Act: Law establishing the legal framework for electronic documents and signatures, relevant if the authorization letter is to be used in electronic format.

Singapore Contract Law: Fundamental legal principles governing contract formation, including requirements for valid authorization, clear consent, and authority delegation.

LTA Regulations: Administrative requirements and regulations set by the Land Transport Authority for vehicle-related transactions and transfers.

Insurance Requirements: Specific requirements from insurance companies regarding vehicle possession and authorization for release.

Vehicle Dealership Documentation: Specific documentation requirements from vehicle dealerships or storage facilities for releasing vehicles to authorized parties.