We have them in colorful, historic (1920s) Cocoanut Grove. They are non-electric and do only short jaunts for the tourist-passengers. They work only at night. They bear no lights and NO reflectors. And they do stunts: the driver/runners (they are not pediccabs are constantly up-ending without warning, stopping, reversing directions, to the merriment of the paying couples having such fun! The operators are all young studs, runners, atheletes, in prime condition of body, but without any sense of danger awareness.
If electrified and, of course, lighted or reflector-fitted, restrict them to ten mph (they are pulled vehicles, not pedaled), and put som g-d blinkies on them.
The authorities do nothing here. No one has died yet so far as I know. It is a very congested tourist area. You can't even see them until you are right on them.
The London crackdown was a PR move, and well-deserved. They are motor vehicles if they go 20 per in tight, crowded city traffic.
It was a fair move, imo.