That depends on what country you're trying to ride in.
yes --------- Wiki is world wide covering and it's impossible to answer precisely. Where I lives the motorway speedlimit is 130 km/h and with a low-limit of 50'. Any 125cc motorbike can fullfill those demands. But in many countries it's allowed for youngsters to drive 125ccm's, however it's not for sure that those are allowed on the motorway. In Germany it's under demand of 80km/h restrictor that 16year youngsters may drive 125ccm's and i can't imagine such on the autobahn with its unlimited speed.
a motorbike has an advantage on the road as you can overtake cars with ease and can go really fast
top speed of 250cc motorbike about 100 mph
When I ride I notice that I go faster on a motorbike than I do on an ATV.
The M1
Yes.
62.5-70mph
62.5-70mph
merits of motorway? merits of motorway?
M4
65 mph