Re: becoming frightened by these bikes
Here's my two cents; these bikes will not become common as long as crude oil hovers around $100/barrel. 21st century Americans, or other 'first worlders' will not take to a vehicle like this when they can ride around in something like a mini Starship Enterprise.
These bikes will remain confined to DUI cases, illegal aliens, nearly or fully unemployed and the really, really weird ones (like me!) who, for some crazy reason, want to avoid the automobile.
As rogergendron was getting at, if you look like a societal dropout the police will likely view you with suspicion and will likely hassle you sooner or later. But if you look like someone who is conscious of your own safety and that of others and look as though you wish to be cooperative with traffic, then they'll view you pretty sympathetically.