The 1975–1979 corpus contains a split-screen image of personal transportation in 2025 — and the two screens are showing completely different futures. On one side, O'Neill's "commutersphere" and "magneplane" envision transportation freed entirely from the private automobile: collective, electrically-powered, computer-controlled, cheap enough that you'd hop between space habitats the way you'd catch a bus. On the other side, Adlard's Multiface imagines a future London where the private vehicle has survived but been domesticated — electric, quiet, fume-free, hired by credit card from a terminal, navigated by punching coordinates into a dashboard computer. These aren't the same prediction. They're two different theories of what the car problem would force humanity to become.

What makes this doubly interesting is where Weizenbaum stands between them. Writing in 1976, he looks back at the postwar decades and identifies the private automobile as a case study in technological lock-in — a "cultivated and finally addictive hunger" that computers enabled rather than challenged, by automating production lines to generate "millions of trivial options" on fundamentally identical machines. He wasn't predicting 2025; he was diagnosing how we got trapped. But from 2025, his diagnosis reads as prophecy. The EV revolution that defines personal transportation in our present moment is almost perfectly described by Adlard's electric autos and almost perfectly not described by O'Neill's collective infrastructure — we changed the powertrain, kept the addiction.

The corpus also reveals what none of these authors could see coming: the computational transformation of the vehicle interior. Adlard's auto has "a limited number of controls, instruments and indicators" — a simplified dashboard as a mark of modernity. O'Neill's computer-controlled magneplane routes itself. Clarke gestures at communications consoles that could reduce commuting. But none of them imagined the car becoming a networked computer that happens to have wheels — a screen-filled, software-updated, GPS-tracked, subscription-service-laden device that is, in Weizenbaum's framing, exactly the kind of system that deepens dependency rather than dissolving it.

[O'Neill, The High Frontier, 1977] does the heaviest lifting on the utopian side. His "commutersphere" and "magneplane" are serious engineering proposals, not hand-waving. The magneplane operates in vacuum, reaches 300 mph in silence, runs on unlimited low-cost electrical energy, requires no timetables because computer control makes vehicles available on demand. The travelsphere between habitat cylinders requires no energy at all — it coasts on orbital mechanics. What O'Neill contributes to this observation is the clearest articulation of what the 1970s energy crisis made imaginable: a transportation system that had escaped petroleum entirely, and in doing so had escaped the car. He gets the electrification right, the computer control right, even something like demand-responsive transit right. What he gets wrong is the scale of collective will required — his system only works because the space habitat is designed from scratch, with no legacy infrastructure to defend.

[Adlard, Multiface, 1975] contributes the grittier, more prophetic picture. His future London has electric autos hired from terminals using credit cards, navigated by alphanumeric coordinate input, recharged at autocomplexes. The hiring hierarchy — from a basic "rectangular black box without doors" up to a "glittering silver shape which looked like a spaceship on wheels" costing two months' increments for a one-way trip — maps almost uncomfortably well onto the current tiered landscape of car-share services and luxury EV subscriptions. His autocomplex map, with its "bloated spider" traffic island and concentric ring roads that "any driver leaving the periphery was inevitably sucked in towards the centre," captures something true about how we've computerized traffic management without solving traffic. He also gives us a character who studies a manual to learn to drive an unfamiliar vehicle type — a detail that feels contemporary in an era of software-defined cars with different control schemes.

[Weizenbaum, Computer Power and Human Reason, 1976] provides the critical frame that makes the other two legible. His argument that computers were used to entrench the automobile rather than replace it — automating production lines for "millions of trivial options" instead of enabling mass transit — describes the actual trajectory of 2025 precisely. Tesla is the apotheosis of Weizenbaum's nightmare: a computer company that makes cars, generating vast consumer enthusiasm for a product that is still fundamentally a private vehicle requiring roads, parking, and individual ownership, differing from a 1975 Buick "only trivially" in its social function while differing enormously in its technological sophistication.

[Clarke, The View from Serendip, 1977] contributes the mobile home speculation — the idea that autonomous, self-contained houses could give people "the freedom that the automobile gave our fathers." This is the most spectacular miss in the corpus. Clarke imagined the house becoming mobile before he imagined the car becoming a computer. But the miss is revealing: it shows how thoroughly the 1970s energy and materials thinking was oriented toward physical mobility as the problem to solve, rather than the informational mobility that would actually reshape where people needed to go and why.

The arc across this narrow window is surprisingly coherent. All four authors are responding to the same 1970s crisis: petroleum scarcity, urban congestion, the environmental costs of mass automobility. But they reach for solutions at different scales. O'Neill reaches for the largest possible scale — redesign civilization from scratch in space, build transportation infrastructure that has no petroleum in it at all. Adlard reaches for the smallest tractable change — keep the vehicle, electrify it, computerize it, shift ownership to rental. Weizenbaum refuses the engineering frame entirely and asks why we're optimizing a system we should be questioning. Clarke splits the difference by imagining communications technology making transportation less necessary.

What emerges is that Adlard, the least celebrated of these authors, made the most accurate prediction — not because he was smarter, but because he was more pessimistic about collective action. He assumed the car would survive because institutions and habits survive. O'Neill assumed that if you could engineer a better system, people would adopt it. Weizenbaum assumed that pointing out the trap would matter. Clarke assumed that when communication got cheap enough, commuting would become optional. All three of those assumptions have been partially falsified by 2025. The car survived. Electrification happened within the car paradigm. Remote work happened but didn't empty the roads. And the trap Weizenbaum identified got more elaborate, not less.

This corpus is almost entirely written by and for the Global North, and specifically by men imagining futures for people who already own cars or could afford to. The question of what personal transportation looks like for the majority of the planet's population in 2025 — the motorcycle taxis of Lagos, the three-wheelers of South Asian cities, the informal minibus networks of Latin America — is completely outside the frame. When Weizenbaum critiques the "addictive hunger for private automobiles," he's describing a specifically American consumer psychology; when O'Neill imagines cheap magneplane commutes, his baseline is a population already accustomed to the luxury of choosing where to live relative to work.

The corpus also has no women writing about transportation, which matters: the literature of personal mobility in this period is almost entirely about the driver, and almost entirely assumes the driver's relationship to the vehicle is one of desire and control. Adlard's Isabel, who navigates while Will drives and who would "rather ryde upon a slouthfull asse" than take the cheap electric box, is the closest thing to a dissenting voice — and she's a comic figure. The experience of transportation as something that happens to you, that constrains rather than liberates, that is dangerous in ways that have nothing to do with petroleum, is not in this corpus at all.

Finally: none of these texts imagined the gig economy of personal transportation — the Uber driver, the delivery cyclist, the warehouse worker whose entire working life is shaped by an algorithm routing them through a city. The 2025 transportation landscape is defined as much by this labor configuration as by any technology. The corpus imagined who would ride. It didn't imagine who would be paid to drive, or what that would cost them.