Just got home from our annual trip to Oklahoma City to sell the excess clothing. It was cold, but no wind and it did warm up later as the day progressed. Among the way, noticed a new road sign. DO NOT IMPEDE LEFT LANE.How many of us know the meaning of impede???? I had to come home and look it up. What ever happened to SLOW TRAFFIC KEEP RIGHT??? By the time one figures it out, you are either off the road or still trying to figure out if you are impeding or not!!!