Related: Why are we not installing an over-head electric rail at freeways that tall trucks and buses could use? I understand that at high speeds the kind of sys

Related: Why are we not installing an over-head electric rail at freeways that tall trucks and buses could use? I understand that at high speeds the kind of system used by Trolley-buses the poles would constantly fall off or the wire themselves would wear and tear. But what if one had sturdy beams instead of wires that could guide the trolley-poles, and indirectly the driver to stay in-lane. More like a third-rail, that is 4-5m above the road. These trucks and buses could then have a weaker combustion engine to use off electricity, but perform the majority of the trip, on the freeway, on electricity. I understand that not all countries have a near mix of 50% hydro and 50% nuclear electric power to make this decrease pollution.