What is the primary danger of driving a heavy commercial truck with a worn or slipping clutch (embrayage qui patine)?

1. Loss of tractive drive power on steep uphill climbs, inability to maintain speed, severe clutch overheating, and loss of effective engine braking on descents
2. The steering wheel will spin in reverse
3. The headlights will turn into high-power lasers
4. The fuel tank will inflate with air pressure