I also have trouble following the route in cities. For example Albuquerque, NM. I don't understand/see the differences between the "blue" highlights, dotted line, highlighted route with arrows or the difference between the main route line and the alternate route line. If there are color differences I don't see them. For example the intersection of Tramway Boulevard and the I40 frontage road. Headed east do I turn north, go straight, or turn south? In other less confusing combinations you may have a highlighted route and then a blue line leaves it. Do I follow the highlighted route or the blue line. (Purple and blue look the same to me.)
Also on the phone (android) when I enlarge the image at some point all I get is a blue line- no map and all other markings disappear. I don't seem to have that problem on the IPad.