In a roll on run, the vehicle operator ________.

• A. Maintains a steady speed
• B. Accelerates in one gear
• C. Shifts gears continuously
• D. Applies brakes intermittently

Answer: (B)

Roll-on runs test how quickly the vehicle can gain speed while staying in a fixed gear, applying throttle smoothly to increase speed without shifting gears. The operator stays in one gear and increases power to see how the drivetrain responds and how quickly acceleration occurs in that gear. That’s why accelerating in one gear is the correct description. Maintaining a steady speed would mean no acceleration, shifting gears continuously would change gears during the run, and applying brakes intermittently would reduce speed rather than test acceleration.