QUEWZ-98 is a microcomputer analysis tool for planning and scheduling use in freeway work zone lane closures. It analyzes traffic conditions on a freeway segment with and without a lane closure in place and provides estimates of the additional road user costs and of the queuing resulting from a work zone lane closure. The road user costs calculated include travel time, vehicle operating costs, and excess emissions. This report is a user’s manual for QUEWZ-98. After describing the capabilities and input data requirements of QUEWZ-98, it provides instructions on using Q98MENU, a menu-driven user interface, to run QUEWZ-98. It also includes three examples to illustrate the various input and output options that are available.