18. Deviation.

The private carrier must carry the goods by the agreed route1 or, where none is agreed, by his usual or customary route2. A carrier who departs from the required route without lawful excuse3 commits a deviation and becomes an insurer of the goods4. The carrier is thereafter strictly liable for all ensuing loss or damage unless he can show that the loss or damage arose through the fault of the consignor or other bailor or would have occurred irrespective of the deviation5. In a bailment by way of carriage which is not, because of the terms of the contract,