Texas Transportation Institute (TTI) estimated the annual cost of incidents in Honolulu at $190 million and ranked it as the 12th most congested city in the nation, same as N.Y. City. These motivated a simulation study using INTEGRATION on the potential of incident management (IM) for Honolulu. A 2-freeway corridor was selected as the most promising area for fast-track IM implementation. The simulated incident on Moanalua Freeway increased total network travel times by 16% over the base case. The 60 minute incident increased travel times on the affected freeway by 82% during the incident queue peak. A 42 minute incident duration increased travel times by 40% which reveals the importance of quick response and clearance. Real time information to motorists caused diversion onto the H-1 Freeway saving 40% over the scenario with incident without IM. Diversion is feasible as long as sufficient capacity exists along alternate routes; ramp rather than main line capacity is often the limiting factor. (A*)
Abstract