Evaluation of the damage caused by facility closing and road blockages from increase in travel distances

This paper aims to evaluate the damage caused by facility closing and road blockages for risk management. A simple model with which we can examine the effect of facility closing and road blockades in the same framework is formulated. We analyze the increase in travel distances to the nearest facility when some facilities and roads are closed. Comparing a facility closing with a road blockade, we show that the damage from a road blockade is at most 25% of that from a facility closing. In addition, we demonstrate that much damage is caused when the adjacent facilities and roads are closed.