At his loading point, the ground has been churned up by preceding vehicles and Bob loses traction. What device could Bob use to get himself out of the mud?

Explanation: • PTO: No, a 'PTO' (Power Take Off) allows an ancillary piece of equipment to be powered from the vehicle - it will not affect the driveability of that vehicle.
• Hill assist: No, whilst this may give some improvement under these conditions it is not the best answer here.
• Exhaust brake: The exhaust brake will have no effect on the vehicle traction.
• Diff lock: Yes, locking the wheels of an axle will help reduce wheel spin where one wheel has some grip and the opposite wheel is spinning.

Category: CPC Case Studies: Technical Matters