differential between the brake and accelerator pedals.” Casey and Rogers (1987) found that inadvertent activation of the accelerator while braking is more likely with coplanar pedals. Therefore, the accelerator pedal plate should be positioned lower than the brake pedal so the brake system is activated at a higher amount if there is an accelerator misapplication during a braking event. Foot Control Clearance Definition: The foot control clearance refers to the clearance in the foot well area of the bus operator compartment surrounding the accelerator and pedals. Need for Design Guideline: Clearance is required for the bus operator to safely and effectively the accelerator and brake pedals without interference with their shoe or boot. ACCELERATOR PEDAL DESIGN Table 5 provides a summary for the accelerator pedal design guidelines. Additional guideline information is provided later in this section. Table 5. Accelerator Pedal Design Guideline Summary Dimension/Attribute Updated Design Guideline Accelerator Pedal Plate Length 254 305 mm for standing pedals – Accelerator Pedal Plate Width 76 102 mm for standing pedals – Accelerator Pedal Lateral Angle 10o 15o – 37o 60o at idle position – Accelerator Pedal Horizontal Angle (40o is recommended) 20o 30o – Accelerator Pedal Actuation Angle (25o is recommended) Accelerator Actuation Force 15 40 N (required) – Accelerator Pedal Plate Length Definition: This is the straight-line distance from the bottom to the top of the accelerator pedal plate (Figure 16).
differential between the brake and accelerator pedals.” Casey and Rogers (1987) found that inadvertent activation of the accelerator while braking is more likely with coplanar pedals. Therefore, the accelerator pedal plate should be positioned lower than the brake pedal so the brake system is activated at a higher amount if there is an accelerator misapplication during a braking event. Foot Control Clearance Definition: The foot control clearance refers to the clearance in the foot well area of the bus operator compartment surrounding the accelerator and pedals. Need for Design Guideline: Clearance is required for the bus operator to safely and effectively the accelerator and brake pedals without interference with their shoe or boot. ACCELERATOR PEDAL DESIGN Table 5 provides a summary for the accelerator pedal design guidelines. Additional guideline information is provided later in this section. Table 5. Accelerator Pedal Design Guideline Summary Dimension/Attribute Updated Design Guideline Accelerator Pedal Plate Length 254 – 305 mm for standing pedals Accelerator Pedal Plate Width 76 – 102 mm for standing pedals Accelerator Pedal Lateral Angle 10o – 15o Accelerator Pedal Horizontal Angle 37o – 60o at idle position (40o is recommended) Accelerator Pedal Actuation Angle 20o – 30o (25o is recommended) Accelerator Actuation Force 15 – 40 N (required) Accelerator Pedal Plate Length Definition: This is the straight-line distance from the bottom to the top of the accelerator pedal plate (Figure 16).
tcrp_rpt_185_DesignTool1.docx