The first day I could not make it show traffic no matter whether it said show traffic or not. I gave up and added google's website icon which does show traffic just like the original app did. After reading this thread I checked again and now it shows the broken red lines which I swear it didn't show originally........?
Google Maps showed clear roads as green. Apples's maps just show the road as standard color if there is no traffic on the road, red lines for traffic. It's working, just different than what we're used to.