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This study evaluates accessibility impact of future high speed rail(HSR)corridor on the Piedmont Atlanta Megaregion(PAM)in the United States.A geographic information system(GIS)tool is used to conduct the accessibility study.The door-to-door approach is adopted to evaluate the multimodal(including roadways and HSR)travel time.Three accessibility indicators are selected: weighted average travel time(WATT),daily accessibility(DA),and potential accessibility(PA).The selected accessibility indicators are calculated by using the estimated travel time at a geographical level.The results indicate that the building of the HSR corridor within the PAM will improve the accessibility at a megaregional level.Different indicators result in different rankings for cities in the PAM.The inequality in megaregional accessibility is decreased due to the new HSR corridor.