Assessing the impact of grenade explosion towards Phnom Penh's road network reliability

摘要

Under normal circumstances,the motorist optimal route choice is based on the perception of shortest route between the successive destinations.However,during disaster,some links and nodes are not accessible and consequently motorists reroute their commutes based on limited road network performance information.Therefore,the entire road network reliability cannot be optimized.Therefore,an efficient traffic diversion plan is required to improve the road network reliability.We used the Technique for order of Preference by Similarity to Ideal Solution(TOPSIS)to rank all nodes in the study area based on their values of betweenness and closeness.The study aims to assess the impact of grenade explosion towards Phnom Penh's roadnetwork reliability in Chamkar Mon district and a traffic diversion plan then wasdeveloped to keep the traffic movement unaffected.The results indicated that there are 4 nodes their TOPSIS rank index value(RIV)increased greater than 25%,while,on the other hand,there are 9 nodes with TOPSIS RIV value decreased greater than 25%.The results also showed that 6 nodes with TOPSIS RIV persists comparatively high before and after the incident.These information was used as the basis of the design of the traffic diversion plan.