The 1975–1979 corpus splits cleanly on personal transportation — and the split reveals something about what each author could see from their historical position. Gerard K. O'Neill imagines transportation freed entirely from its earthly constraints: no petroleum, no aerodynamic drag, no sonic booms, no complicated electronics. His "commutersphere" and "travelsphere" are essentially ballistic pods launched by habitat rotation, coasting through vacuum on pure physics, arriving at their destinations by the same logic a thrown ball follows. The cost per passenger-mile drops to a fifth of contemporary jet travel not through engineering genius but through subtraction — remove the atmosphere, remove the engine, remove the crew, and transportation becomes nearly free. O'Neill gets the economics of electric and magnetic propulsion directionally right, but relocates the whole problem to space to solve it cleanly.

Meanwhile, Joseph Weizenbaum looks at the same moment — the mid-1970s, peak automobile culture — and sees something O'Neill doesn't: that the computer has already been conscripted to entrench the private automobile rather than replace it. His observation is surgical. The technology that could have rationalized transit, that could have made mass transit more responsive than a million identical cars, was instead used to automate production lines so consumers could select from "millions of trivial options" on fundamentally identical vehicles. Weizenbaum names the addiction directly: the "cultivated and finally addictive hunger for private automobiles." From 2025, this reads as prophecy. The automobile didn't get displaced by mass transit. It got smarter, quieter, and electric — but it remained a private automobile. The addiction held.

Mark Adlard's Multiface is doing something neither O'Neill nor Weizenbaum quite manages: dramatizing the class topology of personal transportation in a future Britain. Will's encounter with the auto-hire terminal — working backward through the price tiers from the silver spaceship-on-wheels to the rectangular black box without doors — is a perfect miniature of 2025 urban mobility. The cheapest option is barely a vehicle at all; the most expensive requires two months of accumulated credit for a one-way trip. The electric autos are quiet and fumeless, yes, but access to them is stratified by the same "increment" economy that stratifies everything else in Tcity. Adlard got the electrification right. He also got the inequality right. What he missed was the app — the interface that now mediates the entire transaction.

Arthur C. Clarke, writing in The View from Serendip, makes the most interesting structural argument: that communications technology would substitute for transportation. If you can have face-to-face interaction with anyone anywhere via a "comsole," why commute? Clarke predicted the city would begin to die, that the vast conurbations would fade as people chose the easier electronic way of life. From 2025, the verdict is complicated. The pandemic briefly proved Clarke's thesis — remote work collapsed commuting, city centers hollowed out. But cities didn't die. The autonomous home never materialized. And crucially, the transportation infrastructure Clarke assumed would persist (747s, road and rail systems) has indeed persisted, essentially unchanged in its basic logic even fifty years on.

[O'Neill, The High Frontier, 1977] contributes the era's most elaborated positive vision of transportation transformation. The magneplane passages are technically literate — O'Neill understood dynamic magnetic levitation, superconductors, vacuum drag — and his space-habitat transit system anticipates modern hyperloop thinking with uncomfortable precision. But the revealing detail is the "commutersphere": a vehicle with no engine, no crew, no fuel cost, operating by computer control at intervals of a few minutes. O'Neill was imagining what we now call on-demand transit — but only solvable, in his framework, by leaving Earth entirely.

[Weizenbaum, Computer Power and Human Reason, 1976] provides the critical counterweight. Where O'Neill sees technology liberating transportation, Weizenbaum sees it having already locked transportation into its most wasteful form. The automobile production line passage is the sharpest piece of analysis in the corpus on this lens — it explains, in 1976, exactly why 2025 still has traffic jams. Computers were used to optimize the existing system rather than replace it. This is the canonical 20th-century technology trap, and Weizenbaum named it before most people noticed it was happening.

[Adlard, Multiface, 1975] contributes the ground-level social texture the other authors lack. The auto-hire terminal with its tiered price panels, the alphanumeric scanner, the credit card in the scanning slot — this is recognizably the rental car kiosk, the Zipcar app, the Waymo fare calculator. Adlard's future London has electric vehicles, yes, but they're embedded in the same class structure as everything else. The "paveline" (a moving pavement) handles pedestrian flow; the autos handle status and distance. His protagonist Will finds the cheapest auto barely navigable, its instruction manual incomprehensible, its road system — the "Autocomplex" between sectors — a spider's web that "frightened him merely to look at." This is the user experience of 2025 urban mobility described with uncomfortable accuracy.

[Clarke, The View from Serendip, 1977] contributes the substitution thesis — the idea that better communications would reduce the need for personal transportation. Clarke was right that teleconferencing would emerge and that face-to-face business interaction would become electronic. He was wrong that this would hollow out cities or eliminate commuting at the scale he imagined. The 2020–2025 period gave his thesis its best test run, and the result was partial: remote work spread, but physical mobility remained deeply culturally embedded, and the transportation infrastructure he thought was already obsolete in 1977 is still carrying most of the world's travelers.

The 1975–1979 window on personal transportation is defined by a single pressure: the 1973 oil crisis had just demonstrated that petroleum-dependent private transportation was systemically fragile. Every author in this corpus is responding to that shock, but in radically different ways. O'Neill escapes the problem by leaving the planet. Weizenbaum diagnoses it as a structural lock-in already too deep to escape. Adlard fictionalizes a future where electrification has happened but inequality has not been solved. Clarke bets on substitution — communications replacing transportation.

What none of them fully imagined was the specific form 2025's transportation actually took: the networked private vehicle, where the automobile persists but is hailed, tracked, routed, and increasingly driven by software. The Uber, the Tesla, the Waymo — these are Weizenbaum's nightmare (computers entrenching the private car) combined with O'Neill's on-demand scheduling logic, delivered through Clarke's communications infrastructure, priced in Adlard's tiered increment economy. The synthesis happened; none of them saw it coming as a synthesis.

This corpus is almost entirely male, almost entirely Anglo-American, and almost entirely focused on transportation as a technical and economic problem. The social experience of moving through space — the vulnerability of a woman alone in a vehicle, the experience of transit-dependent workers, the specific geography of car-dependent American suburbs versus European city grids — is largely absent. Adlard gestures toward class but not toward race or gender as axes of transportation inequality.

The corpus also has no voice from the Global South, where the most dramatic transportation transformations of the next fifty years would actually occur: motorcycle-taxi networks, informal transit systems, the explosive growth of cities that never had the automobile infrastructure Clarke and O'Neill took for granted. The "personal transportation" these authors imagine is always already the transportation of the relatively affluent — it's about improving mobility, not about the billions for whom basic mobility remains unresolved. That's the frame the telescope can't see around.