Accelerated Bridge Construction Keeps Tappan Zee Bridge Open Oct, 2009 By Helena Tam, P.E., Mohammad Shams, Ph.D. and Kenneth Standig, P.E. In Feature This article is currently only available in PDF format, please click the link to the top right. About the author ⁄ Helena Tam, P.E.Helena Tam, P.E. is a Project Engineer in HDR’s Manhattan office. She can be reached at helena.tam@hdrinc.com. Prev Creating the Ideal Bridge for Phoenix Sky Harbor’s Taxiway Sierra Next BIM Power: Interoperability