Here’s some advice: If you ever get into a conversation with friends from other cities about traffic headaches, you might want to keep your complaints about driving on Kellogg to yourself. We in Wichita have got it easy, according to a new study by On Numbers, a blog affiliated with the Wichita Business Journal that analyzes census data. Of the nation’s 100 largest metropolitan areas, the Wichita area offers the fastest commute, the study shows.