The 1975–1979 corpus splits cleanly into two imaginative registers when it looks at personal transportation in the near future — and the split is more revealing than either side alone.

On one side, Gerard K. O'Neill is building a transportation utopia for space colony residents: maglev "magneplanes" running in vacuum at 300 mph, engineless "commuterspheres" that require no fuel because habitat rotation provides the kinetic energy for free, "travelspheres" crossing intercontinental distances at supersonic speeds for a fifth of jet-ticket prices. The logic is elegant and internally consistent — O'Neill has correctly identified that aerodynamic drag and petroleum dependence are the binding constraints on terrestrial transport, and simply removes them. His colonists commute the way we browse the internet: frictionlessly, cheaply, on demand, with computer-controlled departure intervals so short that timetables become unnecessary [O'Neill, The High Frontier, 1977].

On the other side, Joseph Weizenbaum is delivering a sharp diagnosis of what actually happened with the automobile on Earth. Computers were used to automate the production of cars offering "millions of trivial options" — vehicles "basically identical" in function but astronomical in apparent variety. The private car wasn't downgraded in favor of mass transit; it was instead deepened as an addiction, its manufacture optimized by the very computational power that might have been turned toward alternatives [Weizenbaum, Computer Power and Human Reason, 1976]. This is the miss that stings: Weizenbaum saw the fork in the road clearly and watched the wrong path get taken. He was writing about the 1960s, but he was describing 2025.

Mark Adlard's Multiface occupies the middle ground — a future Britain where electric autos are real, where hiring charges are tiered by prestige (the black box without doors versus the silver spaceship-on-wheels), where an autodrive system guides vehicles through tunnels automatically, and where the infrastructure complexity (the "bloated spider" interchange map, concentric ring roads) remains thoroughly, recognizably terrestrial in its dysfunction [Adlard, Multiface, 1975]. The gas turbines run in "total silence" after 200,000 kilometers without maintenance — a technical idealization — but the roads, the tunnels under the Thames, the chalk scarpments: those are unchanged. Adlard imagined better engines inside the same broken system.

Arthur C. Clarke, writing from Sri Lanka, saw the deeper disruption: not better cars but fewer trips. His "comsole" — a home communications console providing two-way video, document exchange, and library access — would allow "ninety percent of the average executive's business" to be performed without commuting at all. Clarke predicted that "men will do much less commuting, much more communicating," that cities would begin to die as electronic connection replaced physical movement [Clarke, The View from Serendip, 1977]. This is the prediction that landed closest to 2025 reality — not because cities died, but because the pandemic-accelerated remote work revolution did exactly what Clarke described, for exactly the reasons he named.

[O'Neill, The High Frontier, 1977] contributes the era's most technically elaborated vision of transport — and its most telling blind spot. O'Neill's maglev and travelsphere designs are genuinely prescient about the physics: commercial maglev now operates in Japan and China, and hyperloop concepts are direct descendants of his vacuum-tube logic. But his entire framework assumes the space colony gets built first. Every transport innovation depends on the habitat infrastructure that never materialized. His vision was right about the technology and wrong about the prerequisite.

[Weizenbaum, Computer Power and Human Reason, 1976] is the corpus's sharpest analyst of why transport didn't change. His observation that computers automated automobile variety rather than automobile alternatives describes the exact dynamic that produced 2025's landscape of 50 trim levels on pickup trucks while American rail languishes. He got the mechanism right even as he framed it as a lament about missed possibility.

[Adlard, Multiface, 1975] contributes the most textured near-future street-level picture: electric vehicles as a real but stratified consumer product, autodrive as a feature rather than a revolution, infrastructure complexity as a persistent social barrier. The detail of the hiring-charge tiers — where the cheapest auto is a doorless black box and the most expensive looks like a spaceship — maps almost uncomfortably well onto 2025's EV market, where a base Nissan Leaf and a Tesla Cybertruck occupy the same nominal category.

[Clarke, The View from Serendip, 1977] provides the insight that the other authors miss entirely: that the most important change in personal transportation might be substitution rather than improvement. His prediction that communications technology would reduce commuting anticipated remote work more accurately than any of the transport-focused visions. Clarke also noted, correctly, that "the road and rail systems will still be basically the same" in the near-term future — infrastructure inertia would dominate over innovation.

These authors share a 1970s energy-crisis context that made petroleum dependence feel obviously temporary — the question was only what would replace it. O'Neill chose electricity and vacuum; Adlard chose electric motors in familiar chassis; Weizenbaum mourned the road not taken toward mass transit. None imagined that petroleum dependence would persist essentially unchanged into 2025, with electrification arriving slowly, unevenly, and embedded in the same car-centric infrastructure. The energy crisis turned out to be a price shock, not a structural break.

The deeper pattern is a split between technical imagination and systemic imagination. O'Neill and Adlard could imagine better vehicles. Weizenbaum and Clarke could imagine different systems. In 2025, the technical improvements have arrived — EVs, navigation software, some autonomous features, real maglev trains — while the systemic alternatives remain marginal. The corpus's pessimists read more accurately than its optimists, not because they understood technology better, but because they understood institutions better.

This corpus is almost entirely British and American in perspective, which means it imagines transport futures through the lens of car-dependent urbanism. The actual 2025 story of personal transportation includes the explosive growth of electric two-wheelers and three-wheelers across South and Southeast Asia, the maturation of Chinese high-speed rail as a genuine mass personal transport system, and the urbanization patterns of the Global South that created neither the American suburb nor the European transit city but something else entirely. None of these trajectories appear in the passages retrieved.

There's also a class blind spot running through all these texts. O'Neill's commuters are professionals choosing between habitats "as different as Rome and Kansas City." Adlard's auto-hirers are stratified by "increments" but all have access to the system. Weizenbaum critiques the automobile's cultural dominance but doesn't examine who gets stranded when mass transit fails. The 2025 reality — in which transportation poverty is a major driver of economic immobility, and in which autonomous vehicle promises have consistently been captured by premium markets first — falls outside what this corpus could see.