Pickup or delivery services will not be performed by ABF at any site for which it is impracticable to operate vehicles because of:

1. The condition of roads, streets, driveways, alleys or approaches thereto;

2. Inadequate loading or unloading facilities;

3. Strikes, labor disputes, riots, acts of nature, the public enemy, the authority of law, the existence of violence, disturbances tending to create reasonable apprehension of danger to persons or property, or any acts beyond the control of ABF.