Many of the nation’s major urban highways have worn out, and more are wearing out every day. Reconstruction projects are complex, time-consuming, and apt to create major traffic disruptions unless careful measures are taken to prevent them. The critical question is what happens to all the existing traffic on the highway while reconstruction is underway’ The normal flow of traffic cannot simply be suspended until everything is back to normal. Rebuilding projects are becoming increasingly common throughout the United States. Frequently, the news reports serious accident or some hours-long delay caused by chronic congestion. But it need not be this way. Many departments have found ways to mitigate the adverse impacts of major highway reconstruction. It is possible to plan and manage projects so that they are finished quickly and with minimal complaints. The National Conference on Corridor Traffic Management for Major Highway Reconstruction, under the direction of the TRB Steering Committee, brought together a large number of experts that shared their experiences in workshops, developed an extensive checklist of factors to be considered in planning and managing major reconstruction projects, and now offer them here through the medium of this Transportation Research Board Special Report for the use of others contemplating similar projects.