The is a downside to overhead lines: they block the highway to overly high transports. These are rare, but from time to time there are oversized loads that need to be moved and the large highways are normally the prime candidates for such transports. For this reason many bridges are actually higher than the normal permitted hight. So those parts where the bridges would allow a cheap installation are those that may be needed for exceptional transports.
That was one of my first thoughts, what if some dumbass with a crane or dump truck extended, goes under it? Bzzt...
Counter to that, the wiring is merely off to the side, one lane (at least what's shown) -- it reduces only the width of available extra height. So do underpasses, even extra-tall ones, so it might not be a big deal. Anyway, placement is all up to the civil engineers, they can look at tons of alternatives, both in design (the lane could be added to an existing highway, keeping the same minimum oversize width) and selection (perhaps prioritizing somewhat out-of-the-way routes, and pricing them more attractively).
I'm curious how cost is logged. Do they use transponders? Surely they'd put license plate cams every so often, but that won't catch everyone. It would be a rather peculiar scam to equip an average car, van, truck, whatever with a pantograph... but if they can't find you, what would they do? Can't exactly de-energize a whole line for a few leeches. It could be segmented, and electronically negotiated (maybe put some AC-coupled comms into the line before energizing it, and the sparking noise drowns out everything else), but that would be a hell of a lot of segments to manage, vehicle-length only.
Conversely, the cost could be externalized as a general tax, returning the surplus by making conversion kits somehow available to other potential users. (Would that even work, a 3m tall panto sticking up from a commuter car?
) Eh, hard to make sense of such an arrangement, probably better to stick with subscription + enforcement.
It has one super advantage: it prevents trucks from overtaking.
Nah, hybrids.
Which means they can get away with much smaller batteries too, if only used for maneuvers and surface navigation, and can recharge en route.
Tim