Not a problem re: 40mph roads.
I’d love to have one for SF.
I say this as someone who wants a commuter vehicle similar to this. It's fine for me if it cannot go on the freeway, but it must be able to not hold up traffic everywhere else.
Edit: I also prefer the shape of the Toyota iRoad. While that thing can go 37mph I think 50mph or at least 45 is the minimum to not be a nuisance.
I'm always surprised rich parents don't buy these for teenagers since you can drive them at any age - no need to wait till you have a driving license, and significantly more practical than a bicycle and more independance/cheaper than an uber.