Yikes, 160kph is 100 mph! Sorry, but in my opinion that's getting much too high. 70 to 80 mph is probably about as high as it should go.
160 kph is about the limit where people tend to end up if there is no limit as the fuel consumtion is skyhigh at this speed and it is also getting somewhat uncomfortable in most cars. Sure, a few will go much faster, but not those with a lick of common sense.
