Attention, I-5 and State Route 520 (SR 520) drivers. I hope your merging skills are up to the task. A major traffic shift will greet you on Monday morning, and it will take some getting used to. Getting on eastbound SR 520 from either direction of I-5 hasn’t changed since the interchange was built. Northbound I-5 drivers end up in the right lane of eastbound 520. Southbound I-5 drivers end up in the left lane. That switches this weekend. Come Mo…