The 1975–1979 corpus splits into two irreconcilable visions of personal transportation in 2025, and the split is more revealing than either vision alone.

On one side, Gerard K. O'Neill imagines transportation as an engineering problem already solved by physics. His "commutersphere" and "travelsphere" require no engines, no fuel, no complex electronics — they exploit rotation, magnetic levitation, and vacuum to move people at Concorde speeds for less than the cost of a bus token. The key insight O'Neill keeps returning to is that Earth's transportation is expensive and cramped because of Earth — aerodynamic drag, weather, the speed of sound, petroleum scarcity. Remove those constraints and you get something luxurious, cheap, and nearly effortless: "a few minutes in the runabout, five minutes on the magneplane, a half-hour flight in a travelsphere" to have dinner in another habitat with a different climate. [O'Neill, The High Frontier, 1977]

On the other side, Mark Adlard's Tcity already has electric autonomous vehicles — silent, battery-powered, recharged at Autoterminus stations — but they exist inside a profoundly stratified society where the cost of movement enforces class hierarchy. Will studies the hiring manual for weeks. The cheapest auto is a rectangular black box with no doors. The silver spaceship-on-wheels costs two months of increments for a one-way trip. The road map of the Autocomplex between sectors is so labyrinthine it "frightened Will merely to look at it." [Adlard, Multiface, 1975] Adlard got the technology right — silent electric vehicles, autonomous navigation, credit-card payment — and got the social logic right too: mobility as a rationed resource.

Weizenbaum, writing as a critic rather than a visionary, names the mechanism that explains why Adlard's world, not O'Neill's, is the one we're living in. The computer, he argues, was available to downgrade the private automobile in favor of mass transit, but was instead used to automate production lines so consumers could choose "from among millions of trivial options on their new cars." [Weizenbaum, Computer Power and Human Reason, 1976] The technology was always capable of enabling better systems. What it actually enabled was the proliferation of the existing system.

Standing in 2025: we have Adlard's electric vehicles, his autonomous navigation, his credit-card payment infrastructure, and something very close to his class stratification of mobility — a Tesla costs two months of increments for most people. We do not have O'Neill's maglev commuter systems (though they exist in prototype), and the "commutersphere" remains speculative. What the corpus didn't anticipate was the specific form the transportation revolution would take: not public infrastructure but privately-owned, app-mediated, gig-economy mobility — Uber, Lyft, e-scooters — which is neither O'Neill's collective elegance nor Adlard's municipal electric fleet, but something stranger and more precarious than either imagined.

[O'Neill, The High Frontier, 1977] does the most imaginative heavy lifting. His transportation passages are remarkable not for predicting specific technologies but for their underlying logic: that the constraints of current transportation (petroleum, aerodynamics, weather, the speed of sound) are local and contingent, not permanent. His maglev description is prescient — "dynamic magnetic levitation," superconductors, vacuum operation at 200–300 mph — and essentially correct as engineering. What he couldn't see was that the constraint wasn't technical but political: who builds the infrastructure, who owns it, who profits.

[Adlard, Multiface, 1975] is the corpus's sharpest predictor. Electric vehicles, autonomous navigation, credit-card payment, tiered access by cost — all present. More importantly, Adlard embeds transportation in social architecture: the Autocomplex map as class geography, the auto manual as literacy test for upward mobility. His Jan character, an Executive, rides alone in a self-driving gas-turbine vehicle through an empty tunnel, luxuriating in "being part of a perfectly engineered machine" while imagining the "queues of stationary cars" of the previous age as a horror. That image — the comfortable individual vehicle contrasted with the congested masses — is exactly the ideological picture that sells premium EVs in 2025.

[Weizenbaum, Computer Power and Human Reason, 1976] provides the diagnostic frame. His argument that computers were used to maximize choice within the existing automobile paradigm rather than to enable mass transit alternatives reads, fifty years on, as a precise description of what actually happened. His phrase "cultivated and finally addictive hunger for private automobiles" anticipates the psychological dimension of car culture that neither O'Neill nor Adlard fully engages.

[Clarke, The View from Serendip, 1977] contributes the mobile home vision — autonomous houses that could be relocated by sky crane, entire communities migrating seasonally — which is the era's most radical rethinking of the relationship between dwelling and transportation. It hasn't happened, but the "autonomous home" concept anticipates both the tiny-house movement and the digital nomad phenomenon, where mobility is achieved by decoupling work from location rather than improving physical transport infrastructure.

The arc across this narrow window (1975–1979) runs from infrastructure optimism to social realism to systemic critique. O'Neill, writing in the immediate aftermath of the oil crisis, imagines transportation solved at the level of physics and engineering — build the right structures and movement becomes nearly free. Adlard, writing in the same moment, accepts that the technology will arrive but asks who controls access to it. Weizenbaum, the outsider, points at the political economy that determines which technical solutions get built.

What's striking is how completely the corpus assumes the automobile's dominance as the problem to be solved or circumvented. O'Neill escapes to space. Adlard replaces internal combustion with electric motors but keeps the individual vehicle. Clarke imagines eliminating commuting via telecommunications. None of them imagines the automobile's dominance simply... continuing, in electrified form, for another fifty years. The 1970s were a moment when the car seemed genuinely threatened — by oil scarcity, by urban congestion, by environmental concern. These authors all wrote as if that threat would force a reckoning. It didn't. The car survived, electrified itself, and the reckoning was deferred.

The corpus is almost entirely male and British-American, which shapes its transportation imagination significantly. O'Neill's habitats are imagined from the perspective of someone who designs infrastructure; Adlard's Tcity is observed by someone learning to navigate it; Clarke writes from Sri Lanka but toward a Western audience. What's missing is any perspective from the majority of the world's population who were never in the automobile paradigm to begin with — the Global South's relationship to transportation, where the relevant question in 2025 isn't "electric vs. combustion" but "motorcycle vs. bicycle vs. walking," and where the actual transportation revolution has been the proliferation of cheap motorbikes and, more recently, electric two-wheelers.

The corpus also can't see the platform economy as a transportation form. Uber, Lyft, Grab, Gojek — the idea that personal transportation would be reorganized around algorithmic dispatch, gig labor, and surge pricing is entirely outside the frame. Adlard comes closest with his tiered electric fleet, but he imagines municipal ownership, not venture capital. The specific combination of autonomous-vehicle technology with precarious labor and extractive pricing — the actual shape of 2025 urban mobility — required a vision of Silicon Valley that none of these authors possessed.

Finally: the passages retrieved are thin on the embodied experience of transportation — the texture of waiting, the anxiety of range, the particular quality of being moved by a machine you don't control. Adlard gestures toward this with Will's bewilderment at the Autocomplex map. But the phenomenology of contemporary transportation — the AirPods in, the Uber rating anxiety, the e-scooter helmet you're technically supposed to wear — is below the resolution of this telescope configuration.