These already exist. But compared to an electric car they're less safe, slower, less comfortable, have less cargo capacity, etc. Their primary advantage is being less expensive. The reason they aren't already used more is some combination of not being able to meet the relevant safety standards and their cost advantage not overcoming their numerous disadvantages.
There is a reason hospital emergency rooms call motorcycles donor cycles. The fatality rate for that kind of transport is astoundingly high.
Get the big lumps of steel off the roads and you have far less issues at the ER.
It isn't. If you want to go 60MPH on an ebike, it's not just hitting a car at 60MPH that will kill you, it's hitting anything at 60MPH with nothing to protect you from it, including the ground.
The only way for something with no airbags, crumple zones or even seatbelts to be as safe as a car is to limit the top speed to about 20MPH, at which point the collective response will be "no" because you're tripling the length of everyone's commute.