Notwithstanding anything contained herein to the contrary, it is hereby understood and agreed that the insurance under this Policy is extended to cover loss or damage to the property insured under the Material Damage Section directly caused by fire or explosion , collision or contact of conveyance with external object other than road pavement , air or water ,overturning or derailment of conveyance,breakage of bridges whilst such property is in transit by road vehicles within Thailand to the Contract Site for the purpose of pursuing the contract works insured under this policy including the risk of loading and unloading.