I don't think there are significant technical limitations, it's really just cost and practicality. Trams and busses and trains have been running off overhead l

I don't think there are significant technical limitations, it's really just cost and practicality. Trams and busses and trains have been running off overhead lines for a long time, so it clearly works. The main issues are that it doesn't obviously scale up (i.e. it works fine for a few trams, but not necessarily for thousands of cars filled with 1-2 occupants each) and it would be very expensive to roll out widely. Especially for last mile transport, where it basically becomes infeasible. There's just too much road. Essentially, it is a viable alternative, but only where public transport is the major form of transportation. If people are still driving thousands of cars rather than taking the bus then it's impractical.