Rush hour traffic moves along I-35W on Tuesday, Jan. 14, 2025, in Minneapolis, Minn. (Ellen Schmidt/Minnesota Reformer) Welcome to The Topline, a weekly roundup of the big numbers driving the Minnesota news cycle, as well as the smaller ones that you might have missed. This week: speed limit changes; repeat traffic offenders; where air pollution is getting worse; the small business economy; and lead pipe removal…