(Portland, OR) -- Drivers should expect delays starting Friday night on I-5 northbound from Terwilliger Boulevard to Corbett Avenue in Portland. Construction crews will be working on the base and support for new RealTime signs. The right lane of I-5 northbound will be closed from 8 p.m. Friday through 6 a.m. Monday and the center lane will be closed each night from 10:30 p.m. to 5 a.m. leaving only one lane for traffic.