yeah i ride on 40 mph streets... are there two lanes? if so you can do it cause people have no issues with going around.
tomos are good bikes, take a look around the site and read up and look at pictures and stuff. alot of people will tell you stuff, just make sure you really want the one you want, and take peoples opinions as opinions. do your research though, cause i didnt and ended up with a bike that wasnt what i was looking for.