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

On one side, O'Neill's The High Frontier constructs an entire civilization of movement: maglev trains threading through habitat cylinders in hard vacuum, engineless "commuterspheres" launched by centrifugal force and arriving at sister habitats eight minutes later having consumed zero fuel, "travelspheres" crossing intercolony distances at supersonic speeds for a fifth the cost of a 1970s jet ticket. The engineering logic is meticulous and the social vision is genuinely utopian — young people "jet-setting" between habitats on a bus token, choosing dinner in a community as culturally distinct as Rome from Kansas City. Transportation here is imagined as liberation from scarcity, the bottleneck finally broken by unlimited cheap electricity and computer scheduling.

On the other side, Weizenbaum looks at the same automobile civilization and sees not a problem awaiting a better engineering solution but a political choice already made badly. His observation is surgical: computers were used to automate production lines so consumers could select from "millions of trivial options on their new cars" rather than to enable mass transit or passenger rail that would have actually served people. The "addictive hunger for private automobiles," he argues, was cultivated — and then the computer was enlisted to feed the addiction rather than cure it. Clarke, writing from Sri Lanka, imagines the pressure releasing differently: communications technology will make commuting obsolete, cities will begin to die, and the mobile autonomous home — carried by sky crane, powered by fuel cell — will give people a freedom beyond what the automobile offered their grandparents.

From 2025, all three visions look simultaneously prescient and wrong in instructive ways. Weizenbaum's critique of the car as a manufactured dependency landed exactly right — we built more highways, more suburbs, more "trivial options." But his alternative (mass transit, passenger rail) didn't materialize at scale in America either. O'Neill's maglev is no longer speculative — it exists, in limited deployment — but his vision of it as the spine of daily life hasn't arrived. Clarke's prediction that communications would kill commuting was delayed forty years and then delivered by a pandemic rather than by technological elegance; the city has not died, though it has wobbled.

What none of them saw: the private automobile surviving and being electrified, networked, and partially automated — not replaced but patched. The car won, then got a software update.

[O'Neill, The High Frontier, 1977] does the heaviest lifting on the engineering imagination. His commutersphere passages are remarkable not for predicting specific technologies but for their systems thinking — he understands that cheap transportation requires cheap energy, that cheap energy enables computer scheduling, that computer scheduling enables on-demand frequency, that on-demand frequency changes how people relate to distance. The detail about the vehicle requiring "no power" for inter-habitat transfer — using only the cylinder's existing rotation — is the kind of insight that shows genuine physical intuition. His blind spot is that he's designing for a blank slate: no legacy infrastructure, no entrenched industry, no political economy of oil. The habitat is a thought experiment that lets him imagine transportation without the weight of what already exists.

[Weizenbaum, Computer Power and Human Reason, 1976] contributes the essential counterpoint: the political economy that O'Neill brackets out. His argument isn't that better transportation is impossible but that the computer — the very tool O'Neill relies on to schedule his magneplane at "intervals of only a few minutes" — was historically deployed to reinforce the automobile's dominance rather than challenge it. This is the sharpest anticipation of 2025 in the corpus: we did indeed computerize the car (GPS, ride-sharing, Tesla's autopilot, the entire "mobility as a service" apparatus) rather than transcend it. Weizenbaum would recognize Uber immediately — computers optimizing private vehicle trips, not replacing them.

[Adlard, Multiface, 1975] offers something neither O'Neill nor Weizenbaum provides: the texture of living inside a future transportation system. His T-city runs electric autos — silent, fumeless, hired by credit card from tiered dispensaries where the cheapest option is a doorless black box and the most expensive looks like a spaceship on wheels. The class stratification is embedded in the rental price. The "Autocomplex" map between sectors is so labyrinthine that Will can't parse it — a perfect image of infrastructure that serves the system's logic rather than the user's. And Jan's drive through the tunnel, gas turbines running silently after 200,000 kilometers without maintenance, nostalgia-tripping about the old carbon monoxide exhausts — that's a recognizable 2025 EV owner's interiority, right down to the self-congratulation.

[Clarke, The View from Serendip, 1977] approaches transportation obliquely, through its negative: if communications become cheap and universal enough, physical movement becomes optional. His prediction that "men do much less commuting, much more communicating" was structurally correct — remote work is real — but his mechanism (the comsole replacing the office) underestimated how much commuting was never about information exchange and always about power, surveillance, and real estate investment protecting itself.

The arc across this corpus runs from replacement thinking to patch thinking, and 2025 has decisively vindicated the latter. O'Neill and Clarke both imagine personal transportation being superseded — by maglev, by travelspheres, by telecommunications making physical movement unnecessary. Weizenbaum, the pessimist, is closest to what actually happened: the existing system absorbed the new technology and used it to reproduce itself. The car didn't die; it got an app.

What's striking is that the utopian visions require a clean break — a space habitat with no legacy roads, a communications revolution that genuinely obsoletes the city. Neither break came. Instead, the 2025 transportation landscape is a palimpsest: nineteenth-century rail networks, twentieth-century highway systems, and twenty-first-century software layered on top of both. Adlard's tiered electric auto rental system — class-stratified, computer-managed, operating within a city that still has tunnels and ring roads — is the most accurate image of where we actually landed.

This corpus is almost entirely male, almost entirely Anglo-American or Anglo-adjacent, and almost entirely focused on transportation as an engineering and systems problem. What's missing is any serious attention to who transportation serves and who it excludes — the spatial politics of race and class that determine who gets a bus route and who gets a highway through their neighborhood, who can afford the silver spaceship rental and who is stuck with the doorless black box. Adlard gestures at class stratification in his rental tiers, but it's texture, not analysis.

There's also no voice here from the Global South, where the actual transportation story of the late twentieth and early twenty-first century was playing out most dramatically — motorcycle taxis, informal transit networks, cities like Lagos or São Paulo developing their own vernacular mobility systems under constraints none of these authors were imagining. O'Neill's habitats are blank-slate utopias; Weizenbaum's America is the only political economy in view; Clarke writes from Sri Lanka but thinks from London. The 2025 that this telescope can see is a wealthy, Western, infrastructure-rich 2025. The other one is outside the frame.