Product Overview

Summary: This Trailer Coupling and Decoupling Safe Operating Procedure sets out clear, step-by-step instructions for safely connecting and disconnecting trailers to vehicles in Australian workplaces. It helps prevent crush injuries, roll-aways, and load failures while supporting compliance with WHS and heavy vehicle safety requirements across transport, construction, agriculture, and logistics operations.

Coupling and decoupling trailers is a routine task in many Australian workplaces, but when it goes wrong the consequences can be severe – including crush injuries, vehicle roll-aways, and uncontrolled movement of heavy loads. This Safe Operating Procedure provides a structured, practical method for ensuring that every trailer connection and disconnection is carried out safely, consistently, and in line with WHS expectations. It covers light and heavy trailers, including plant trailers, box trailers, equipment trailers, semi-trailers and dog trailers, and can be adapted to suit a wide range of industries.

The document walks workers and supervisors through pre-use checks, correct positioning, securing and testing the connection, managing loads and stabilisers, and safely parking, isolating, and uncoupling trailers. It embeds hazard controls such as wheel chocking, brake application, exclusion zones, and communication protocols, reducing reliance on memory or informal practices. By implementing this SOP, businesses can demonstrate due diligence, improve driver and yard safety, reduce damage to vehicles and equipment, and provide a clear training and competency framework for new and existing staff.

Key Benefits

• Reduce the risk of crush injuries, roll-aways and trailer separation incidents during coupling and decoupling activities.
• Ensure consistent, step-by-step practices across all drivers and yard staff, improving safety culture and operational reliability.
• Support compliance with Australian WHS laws and heavy vehicle safety obligations, reducing the likelihood of regulatory enforcement or prosecution.
• Minimise costly damage to towing vehicles, trailers, landing legs, couplings and loads through correct setup and checks.
• Streamline induction and refresher training with a clear, documented procedure that can be used for competency assessment.

Who is this for?

• Truck Drivers
• Delivery Drivers
• Yard Hands and Yard Operators
• Forklift and Yard Equipment Operators
• Transport and Logistics Managers
• Fleet Managers
• Site Supervisors
• WHS Managers and Safety Advisors
• Operations Managers
• Agricultural Machinery Operators

Hazards Addressed

• Vehicle roll-away due to inadequate parking brake application or wheel chocking
• Crush injuries between vehicle and trailer during coupling alignment
• Failure of coupling devices (tow balls, fifth wheels, pintle hooks, safety chains) due to incorrect engagement or damage
• Trailer detachment while in motion because of incomplete connection or missing safety pins/locks
• Musculoskeletal injuries from manual handling of jockey wheels, landing legs, drawbars and safety chains
• Slips, trips and falls around uneven ground, wet surfaces or obstacles during coupling activities
• Pinch and impact injuries when raising or lowering landing legs, ramps and stabilisers
• Struck-by incidents from moving vehicles in yards or loading areas during coupling/decoupling
• Electrical hazards from damaged trailer plugs, wiring, or lighting circuits during connection checks
• Exposure to poor environmental conditions (low light, rain, dust) affecting visibility and safe operation

Included Sections

• 1.0 Purpose and Scope
• 2.0 Definitions and Types of Trailers and Couplings
• 3.0 Roles and Responsibilities
• 4.0 Required Competencies and Training
• 5.0 Required PPE and Equipment
• 6.0 Pre-Operation Checks (Vehicle, Trailer and Work Area)
• 7.0 Safe Approach and Positioning of Vehicle and Trailer
• 8.0 Coupling Procedure – Light Trailers (Tow Ball / Towing Hitch)
• 9.0 Coupling Procedure – Heavy Trailers (Fifth Wheel, Turntable, Ringfeder, Pintle Hook)
• 10.0 Connection of Safety Chains, Breakaway Systems and Electrical Plugs
• 11.0 Post-Coupling Checks and Functional Testing (Brakes, Lights, Stability)
• 12.0 Decoupling Procedure – Securing, Parking and Isolation
• 13.0 Hazard Identification and Risk Controls (Including Traffic Management and Exclusion Zones)
• 14.0 Emergency Procedures and Incident Response
• 15.0 Inspection, Maintenance and Defect Reporting for Coupling Equipment
• 16.0 Documentation, Records and Chain of Responsibility Considerations
• 17.0 Review, Audit and Continuous Improvement

Legislation & References

• Work Health and Safety Act 2011 (Cth) and corresponding state and territory WHS Acts
• Work Health and Safety Regulations 2011 (Cth) and corresponding state and territory WHS Regulations
• Heavy Vehicle National Law (HVNL) and Chain of Responsibility (where applicable)
• Safe Work Australia – General Guide for Workplace Traffic Management
• Safe Work Australia – Code of Practice: Managing the Risk of Plant in the Workplace
• AS/NZS 4968: Heavy road vehicles – Mechanical coupling between articulated vehicle combinations
• AS 4177: Caravan and light trailer towing components (relevant parts)
• AS/NZS 4024 series: Safety of machinery (for plant trailers and yard plant interfaces)