>>2020355First off they are really unsafe because of the standing riding position and a lack of inherent stability because of the tiny wheels.
So if you get one buy a seat attachment this makes it a little safer adds some range because of less wind resistance and is also more comfortable.
If you can afford it picrel has large enough wheels to make it safe.
But then you could just get an electric or otherwise moped.
Final words regarding safety many of them can be as fast as a moped and crashing them, which is quite likely, at that speed can kill you.