Corrigendum

This article refers to:

Managing Large-Scale Multimodal Emergency Evacuations

Article title: Managing Large-Scale Multimodal Emergency EvacuationsAuthors: Hossam Abdelgawad and Baher AbdulhaiJournal: Journal of Transportation Safety & SecurityBibliometrics: Volume 2, Issue 2, pages 122-151DOI: 10.1080/19439962.2010.487636

Issue

It came to the attention of the authors of the above publication through further extensions of the work that the demand file inputted into the simulation model was corrupted. The inputted demand was a fraction (through an incorrect use of a multiplication factor) of the original total demand pertinent to the problem. Therefore, the results presented in Table 4 on Page 144 need to be updated to reflect the correct demand. The methodology and approach remain unaffected. The trends in the percentage improvements due to optimization remain similar to the published results. However, the absolute numbers are higher due to the higher demand. We therefore submit this corrigendum to correct the mistake.

Approach

After thorough review and analysis of the inputted demand files and the network structure, it was decided to re-run the experiments with full demand and report the results, analysis, and findings in light of the complete evacuation demand subject of this study.

Results

After optimizing the evacuation scenarios via temporal optimization (Optimal Temporal Evacuation – OTS), spatial and temporal optimization (Optimal Spatial Temporal Evacuation – OSTE) and comparing the results to the Simultaneous Evacuation (SE) Case; the following revised numbers in the table below shall replace Table 4 in the above publication:

Tabel 4.  

Measures (min)	SE	OTE	OSTE	OTE VS SE	OSTE VS SE
Average total system evacaution time (fitness)	612	463	384	−24%	−37%
Average travel time	612	189	111	−69%	−82%

Comments

–	Percentage savings in the average evacuation travel time, (69% in OTE vs SE; and 88% in OSTE vs SE) are within the range of significant savings originally reported.
–	Percentage savings in the total evacuation time (25% in OTE vs SE, and 37% in OSTE vs SE) are less than what was originally reported due to the higher levels of congestion because of the higher demand.