The corpus from 1975–1979 reveals a striking fork in how speculative fiction processed the future of personal transportation. On one side, O'Neill and Clarke imagined transportation being transcended — replaced by something fundamentally different in kind. On the other, Adlard and Weizenbaum assumed the private automobile would persist, and built their futures around managing, critiquing, or reforming it. Both camps were right about different things, and wrong about different things, and the gap between them maps almost perfectly onto what actually happened by 2025.

O'Neill's "commutersphere" and "travelsphere" in The High Frontier are the most vivid expression of the transcendence vision: engineless passenger spheres flung between space habitats by magnetic acceleration, costing less than a bus token, requiring no fuel. His logic is internally consistent — in vacuum, aerodynamic drag vanishes, and the engineering constraints that make Earth transit expensive simply don't apply. The problem is that O'Neill's transportation imagination is entirely downstream of his habitat imagination. The commutersphere only makes sense if you've already built Island Three. He got the physics right and the preconditions completely wrong. We didn't build the habitats, so we didn't need the spheres.

Adlard's Multiface, set in a future Britain that reads as recognizably 2025-adjacent, takes the opposite approach: the private auto persists, but it's electric, silent, computer-guided, and tiered by class. His "Autocomplex" — a nightmarish interchange between city sectors that terrifies the protagonist just to look at on a map — is the automobile's infrastructure logic pushed to its endpoint. The auto still exists, still requires roads and terminals and credit cards and instruction manuals. What's changed is the propulsion and the class stratification of access. Will can barely afford the rectangular black box without doors; the silver spaceship-on-wheels costs two months of increments for a one-way trip. That tiering of electric vehicle access by economic class is, in 2025, essentially what happened.

Weizenbaum's critique in Computer Power and Human Reason cuts across both visions. Writing as a skeptic rather than a futurist, he identifies the automobile not as a transportation problem but as a political economy problem: computers were used to automate production lines so people could choose "from among millions of trivial options on their new cars" rather than to build mass transit. His counterfactual — that the private automobile "could have been downgraded as a means of personal transportation in favor of mass transit" — reads in 2025 as a road not taken that is still very much visible from where we stand. American cities still lack the rail infrastructure that Parisians and Londoners had in 1975.

[O'Neill, The High Frontier, 1977] contributes the era's most fully elaborated alternative transportation architecture. The maglev system within habitats — high-vacuum, computer-controlled, running at 300 mph in "silence" — anticipates real maglev development with uncanny technical accuracy, but displaces it into a context that never materialized. More revealing: O'Neill's electric runabouts that "find their way home along the bicycle paths at a safe walking speed, following the magnetic lure of a buried wire" are essentially autonomous vehicles, imagined as a solved, mundane problem rather than a contested technological frontier. He got the destination; he miscalculated the path.

[Adlard, Multiface, 1975] does the heaviest lifting for the retrostition reading. The electric auto is already normalized in his future — the instruction booklet explains how motors work and where to recharge at each Autoterminus, treating this as basic literacy. The class gradient of vehicle access (rectangular black box vs. silver spaceship-on-wheels) maps onto the 2025 reality of a used Nissan Leaf versus a Tesla Model S with uncomfortable precision. And the Autocomplex — a traffic interchange so labyrinthine it's literally unintelligible to a first-time driver — captures something real about how car infrastructure scales: it doesn't simplify, it compounds.

[Weizenbaum, Computer Power and Human Reason, 1976] provides the sharpest analytical frame, even though he's not writing speculative fiction. His observation that computers were deployed to entrench automobile culture rather than transcend it — automating production lines for "millions of trivial options" rather than building transit alternatives — is the best single-sentence explanation for why 2025 looks more like Adlard's auto-dependent future than O'Neill's maglev utopia.

[Clarke, The View from Serendip, 1977] contributes an interesting adjacency. Clarke's prediction that improved communications would reduce commuting — "men do much less commuting, much more communicating" — partially came true in ways that reshaped transportation demand without replacing the car. Remote work in 2025 has bent commute patterns without eliminating the automobile's dominance. His vision of the autonomous home, mobile and rootless, freed from infrastructure — carried by sky cranes to new locations — is the one that missed most completely.

The 1975–1979 window sits at a precise historical inflection: the first oil shock had just demonstrated the automobile's geopolitical vulnerability, and the environmental costs of internal combustion were becoming legible. Every author in this corpus registers that the car-as-currently-constituted is unsustainable. But they diverge sharply on the mechanism of change. O'Neill bets on a wholesale replacement — new infrastructure, new physics, new context. Adlard bets on incremental substitution — same roads, same social logic, different propulsion. Weizenbaum bets on neither, arguing that the political economy that produced the car will keep producing cars regardless of what the engineers imagine.

By 2025, Adlard's incrementalism and Weizenbaum's pessimism have proven more predictive than O'Neill's transformational vision. Electric vehicles exist; they are class-stratified; they run on the same road infrastructure; the Autocomplex is still unintelligible. What none of them fully anticipated is the specific form that digital technology would take in reshaping transportation: not autonomous vehicles (which O'Neill imagined as solved), not communications replacing commuting (which Clarke imagined as liberating), but ride-hailing platforms that extracted new economic value from the existing car-dependent infrastructure while making transit alternatives less politically viable, not more.

This corpus is almost entirely male, almost entirely Anglo-American, and almost entirely focused on either elite technological vision or elite technological critique. Adlard's Multiface gets closest to depicting transportation as a class experience — Will's anxiety about affording the right auto is visceral — but even that is filtered through a literary sensibility that aestheticizes working-class constraint rather than inhabiting it. Missing entirely: any perspective on how transportation futures look from the Global South, from women navigating cities designed around male mobility patterns, from the urban poor for whom the question of "which electric vehicle" is irrelevant because the question is whether the bus runs at all.

The corpus also has a structural bias toward imagining transportation as a design problem — what should vehicles be, how should systems work — rather than a governance problem. Who decides where the roads go, who gets displaced to build the Autocomplex, whose neighborhoods get bisected by the autoway: these questions are mostly invisible. Weizenbaum gestures at the political economy, but even he frames it as a missed choice made by abstract historical forces rather than by identifiable interests with names and lobbying budgets. The 2025 reality of transportation — where Uber's regulatory battles, highway funding formulas, and zoning laws matter as much as battery chemistry — is largely outside this corpus's frame of vision.