Taking a look at the speedometer guarantees you aren't driving too fast and looking at the road is a mayor part of (safe)driving. Looking at the glass isn't, be

Taking a look at the speedometer guarantees you aren't driving too fast and looking at the road is a mayor part of (safe)driving. Looking at the glass isn't, because even if you use it to look at the map that distracts you for way too long( >1sec, assuming you have to deal with the interface ).