The 1975–1979 corpus reveals a profound split in how speculative minds imagined personal transportation in the future we now inhabit. On one side, Gerard K. O'Neill's The High Frontier constructs an entire civilization of frictionless movement — "travelspheres" and "magneplanes" and engineless commuter pods that cost nothing to operate because physics does the work. On the other, Joseph Weizenbaum's Computer Power and Human Reason looks at the same technological moment and sees something darker: that computers were deployed not to transcend the automobile but to entrench it, automating production lines so consumers could choose "from among millions of trivial options on their new cars" rather than building mass transit. And Mark Adlard's Multiface imagines a future London where electric autos exist in a rigid class hierarchy — the gleaming silver spaceship-on-wheels available only to Executives, the doorless black box for everyone else — accessed through credit-card scanners and navigated via incomprehensible traffic-circle maps.

Standing in 2025, you can triangulate where reality landed. Weizenbaum was the most accurate, and he meant it as a critique. The computer did automate automobile production to extraordinary complexity; the private car remained the dominant mode of personal transport; mass transit in American cities remained underfunded and politically marginal. What he framed as a tragic choice that needn't have been made turned out to be exactly the choice that was made. O'Neill's maglev transit within habitats has a partial echo — maglev trains exist, electric vehicles proliferate — but the "commutersphere" as a mode of everyday personal travel remains science fiction. Adlard's electric autos, meanwhile, arrived almost precisely on schedule in form if not in social architecture: the 2025 EV is quiet, clean, recharged at terminals, and navigated by dashboard screens. He got the vehicle roughly right. He missed that it would remain privately owned rather than hired by the trip.

Clarke's contribution in The View from Serendip cuts across the transportation question from an unexpected angle: he predicted that improved communications would reduce commuting, that the home console would allow executives to conduct ninety percent of their business without leaving home. This is the prediction that arrived most completely and most strangely. Remote work in 2020–2025 did dramatically reshape commuting patterns — but not by eliminating the city, as Clarke expected. Cities remained; the suburbs sprawled further; the car trip got longer and then, during the pandemic, briefly vanished and then returned. Clarke imagined communications as a substitute for transportation. What happened instead was that communications enabled transportation to reorganize itself spatially rather than diminish.

[O'Neill, The High Frontier, 1977] contributes the most technically detailed vision of future personal transport in the corpus. His "commutersphere" and "magneplane" are not hand-waving — he works through load factors, amortization schedules, and compares per-passenger-mile costs to the Lockheed L-1011. The key conceptual move is removing the engine: a vehicle that costs nothing to operate because it uses the habitat's rotation or magnetic induction. This is O'Neill imagining transportation as infrastructure rather than product — closer to an elevator than a car. In 2025, we have infrastructure-as-transportation in some forms (metro systems, bike-share), but the private vehicle as consumer product remains the dominant paradigm O'Neill was explicitly trying to escape.

[Weizenbaum, Computer Power and Human Reason, 1976] contributes the sharpest analysis and the most accurate prediction, though framed as lament rather than forecast. His observation that "the private automobile could have been downgraded as a means of personal transportation in favor of mass transit" but wasn't — because computers were used to optimize automobile manufacturing instead — reads in 2025 as a structural diagnosis that proved correct. The addictive hunger for private automobiles he describes has only intensified, now extending to electric variants that reproduce the same spatial logic (individual ownership, garage storage, personal navigation) in a cleaner powertrain.

[Adlard, Multiface, 1975] contributes something neither O'Neill nor Weizenbaum provides: the social texture of future personal transportation. His electric autos are hired, not owned; accessed by credit card; tiered by cost in a way that maps directly onto class position. The doorless black box versus the silver spaceship-on-wheels is a more honest account of how transportation technology actually distributes in unequal societies than O'Neill's vision of cheap universal access. The "Autocomplex" map — a traffic circle so bewildering that merely looking at it constricts Will's breathing — captures something true about the experience of urban driving infrastructure that neither the utopians nor the critics quite articulate.

[Clarke, The View from Serendip, 1977] contributes the transportation-by-substitution thesis: that better communications would make physical movement less necessary. His prediction that "men do much less commuting, much more communicating" was partially vindicated by 2020–2025, but the relationship proved more complicated than substitution. Remote work reduced some commuting while enabling people to live further from city centers, which increased car dependency in aggregate. Clarke saw the technology correctly; he missed the political economy that would determine how it was deployed.

The arc across these texts moves from transportation as a solved engineering problem (O'Neill) through transportation as a political choice (Weizenbaum) to transportation as social stratification (Adlard) — with Clarke's communications-substitution thesis running perpendicular to all three. What the corpus collectively missed was the degree to which personal transportation would become a platform rather than a vehicle: a networked system generating data, enabling surveillance, and integrating with financial infrastructure in ways none of these authors imagined. Adlard's credit-card scanner at the Autoexit comes closest, but even he depicts it as a payment mechanism rather than as the edge of a system that tracks movement, prices dynamically, and integrates with identity.

The inflection point the corpus couldn't see was the smartphone. O'Neill's magneplanes run on "computer control" but the user relationship is passive — you board, you arrive. Weizenbaum's computers automate production. Adlard's dashboard has a "green button." None of them imagined the rider as an active node in a continuous information exchange, which is what Uber, Lyft, Google Maps, and Tesla's fleet data represent in 2025. The vehicle became a terminal. That transformation was invisible to all of them.

The most significant gap is the complete absence of the Global South from this transportation imaginary. O'Neill's space habitats are populated by implied Westerners choosing between Rome and Kansas City for dinner. Weizenbaum's automobile critique is American. Adlard's London is recognizably British class-stratified. Clarke writes from Sri Lanka but his transportation futures are equally Western-centric. The actual story of personal transportation between 1975 and 2025 is substantially the story of motorization in China, India, Southeast Asia, and sub-Saharan Africa — billions of people acquiring motorcycles, scooters, auto-rickshaws, and eventually cars in patterns that neither the utopian space-colony model nor the American mass-transit critique addresses.

There are also no women authors in this retrieved slice, and the gender politics of personal transportation — who controls vehicles, who designs infrastructure, whose commuting patterns are treated as default — go entirely unexamined. Adlard's Will drags Isabel through the Autoexit while she quotes Spenser; she has no independent relationship to the machine. That's a telling absence: the 1975–1979 corpus imagines the future of personal transportation as a technical and political problem, not as a question of whose mobility is centered in the design.