____ unforseen circumstances, we should be arriving at our destination shortly.

preposition

1. Excluding by exception excepting

   "… they knew that, barring a miracle, they would never be able to save the large cash outlay required …"

verb

1. To fasten with a long, narrow piece of wood, metal, or other material to fasten with a bar see bar
2. To place bars across to prevent ingress or egress

   "bar the door"

3. To mark with straight stripes, bands, or lines that are much longer than they are wide to mark with bars see bar stripe

   "a feather barred with blue"

4. To confine or shut in by or as if by bars see bar

   "barring prisoners in their cells"

5. To set aside to not take into consideration rule out

   "did not bar the possibility of further measures"

6. To keep out exclude
7. To put forth legal objection to (something, such as a claim or action)

   "final judgment barred the subsequent claim"

8. Prevent, forbid

   "a decision barring his participation"

9. to fasten with a long, narrow piece of wood, metal, or other material : to fasten with a bar
10. to place bars across to prevent ingress or egress
11. to mark with straight stripes, bands, or lines that are much longer than they are wide : to mark with bars : stripe