Evaluation of mechanical tractor pedal extensions.

Area of Science:

• Agricultural Safety and Health
• Human Factors Engineering
• Assistive Technology

Background:

• Farmers with disabilities often modify equipment, including tractors, to suit their needs.
• Modified tractors, especially custom designs like pedal extensions, may lack rigorous safety testing, posing operator risks.

Purpose of the Study:

• To evaluate the safety of mechanical tractor pedal extensions.
• To identify potential hazards associated with pedal extension integration into tractor cabs.

Main Methods:

• A literature review identified 19 potential hazards.
• A validated Hazard Self-Assessment Worksheet (HSAW) was developed.
• 14 experts evaluated six tractor pedal extension designs (three existing, three novel) using the HSAW.

Main Results:

• No single "best" design emerged, but trends were observed.
• Four of six evaluated pedal extensions obstructed the exit path.
• Designs that did not block the exit path were considered safer, especially if custom-fit.

Conclusions:

• Custom fabrication of tractor pedal extensions for specific tractor models is crucial for optimizing operator safety.
• Ensuring clear access to the exit path is a key safety consideration for pedal extension designs.