The corpus from 1975–1979 reveals a striking split-screen vision of personal transportation in 2025: one screen showing the automobile as a solved problem (replaced, transcended, or radically transformed), the other showing it as an addiction that computers merely enabled rather than cured.

Gerard O'Neill's The High Frontier is the most technically specific. He imagines personal transport in space habitats as a layered system: bicycle-speed electric runabouts for the last mile, maglev trains in vacuum tubes at 300 mph between habitat zones, and "commuterspheres" — engineered spheres launched by rotation rather than engines, requiring zero fuel — for inter-habitat travel. The details are specific enough to feel engineered rather than imagined. What's striking is that O'Neill gets the direction right — electric vehicles, autonomous routing via buried wire, the desirability of separating personal transport from mass transit — while locating it entirely in the wrong place. The electric runabout that finds its own way home "along the bicycle paths at a safe walking speed, following the magnetic lure of a buried wire" is, functionally, a description of autonomous vehicle guidance. It's here in 2025. Just not in a space colony.

Weizenbaum's Computer Power and Human Reason is the counter-signal. Writing in 1976, he sees the automobile not as a transportation problem awaiting a technical solution but as a political choice that was made and then locked in. His specific argument: computers were used to automate automobile production lines so that consumers could choose "from among millions of trivial options on their new cars" — rather than being used to build mass transit or substantially differentiate vehicles. The "addictive hunger for private automobiles" he describes was cultivated, not inevitable. From 2025, this reads as prophecy with an edge: we did eventually get electric cars, autonomous features, and app-based routing — but we got them as options on private automobiles, exactly the pattern Weizenbaum was diagnosing as the failure mode.

Mark Adlard's Multiface occupies the middle ground, imagining a future London where electric "autos" are available for hire by credit card, tiered by cost from basic black boxes to silver "spaceship on wheels," navigating autocomplexes of terrifying roundabout-within-roundabout geometry. The system is recognizably ride-share — you don't own the vehicle, you scan a card and get one — but the driving is still manual enough that Will has to study a booklet on how to operate the dashboard. The infrastructure anxiety is vivid and accurate: Adlard's protagonist is paralyzed by the autocomplex map, its concentric rings and radial roads "so that any driver leaving the periphery was inevitably sucked in towards the centre." Anyone who has navigated a UK motorway interchange in 2025 will recognize this.

[O'Neill, The High Frontier, 1977] does the heaviest lifting on the engineering imagination. His maglev system in vacuum — "an ideal dragless, noiseless medium" — anticipated the Hyperloop concept by four decades, and his electric runabouts with autonomous magnetic guidance anticipated the direction of autonomous vehicle development. More interesting is what he reveals about his era's assumptions: he can only imagine personal transport being solved by moving it off Earth entirely. The habitat is the laboratory where the automobile problem gets fixed.

[Weizenbaum, Computer Power and Human Reason, 1976] provides the sharpest political diagnosis. His point isn't that cars are bad but that computers were consciously deployed to entrench them rather than replace them. "The private automobile could have been downgraded as a means of personal transportation in favor of mass transit" — he frames this as a road not taken, a choice made by institutions. From 2025, where Uber and Tesla have computerized personal transport rather than replaced it with mass transit, this reads as a precise description of what actually happened.

[Adlard, Multiface, 1975] contributes the most sociologically textured vision. The tiered hire system — cheapest vehicles for lowest-increment workers, expensive ones for executives — maps almost exactly onto the current Uber/Lyft tiering (UberX, Uber Comfort, Uber Black). His future London has solved private car ownership without solving class stratification in mobility. The character Jan's gas-turbine auto running "200,000 kilometres with no maintenance" through the Channel Tunnel, with automatic headlights and navigation prompts, is recognizably the 2025 premium EV — though Adlard kept the gas turbine where we got the battery.

[Clarke, The View from Serendip, 1977] approaches personal transport obliquely, through its inverse: if communications improve enough, commuting becomes unnecessary, and the city "begins to die." His prediction that "men do much less commuting, much more communicating" is the 2020 pandemic work-from-home shift, seen from 1977. He also offers the mobile autonomous home — carried by sky crane, no pipes or power lines, free to migrate — as a more radical version of the same logic. This didn't happen, but the underlying impulse (untether the dwelling from fixed infrastructure) shows up in the van-life movement and remote-work migration patterns of the 2020s.

The arc across these texts is not optimism-to-pessimism but location-to-location. O'Neill imagines transport problems solved in space because Earth's infrastructure is too entrenched to fix. Clarke imagines transport made irrelevant by communications. Adlard imagines transport rationalized and electrified but still class-stratified and still confusing. Weizenbaum imagines transport as a political economy that reproduces itself. All four are responding to the same 1970s moment: the oil crisis, urban congestion, the visible failure of the American car-and-suburb model. But they draw completely different conclusions about whether the system can be reformed from within.

What none of them imagined is the specific 2025 configuration: private electric vehicles with partial autonomy, summoned by app, owned by corporations or individuals, still stuck in traffic, still requiring enormous road infrastructure, their environmental benefits contested, their autonomy promises perpetually five years away from full realization. O'Neill's solution required leaving the planet. Weizenbaum's required a political will that never materialized. Adlard got closest — card-summoned electric hire vehicles — but even he imagined a more rationalized system than the one we actually built.

This corpus is almost entirely male, Western, and oriented toward either engineering solutions or political economy critiques — both of which treat personal transportation as a system problem. What's missing is any sustained attention to who gets left out of transportation systems: the disabled, the rural poor, the elderly, those without credit cards or smartphones. Adlard's tiered system gestures at class, but the lowest tier is still a hire car with a credit scanner — not a bus, not a wheelchair, not a pair of feet.

The corpus also has no non-Western vantage on transportation futures. The 1970s explosion of motorcycle and moped culture across Asia — which would become the dominant form of personal transport for billions of people — is invisible here. O'Neill's space habitats, Clarke's Sri Lankan vantage point notwithstanding, and Adlard's London all assume a Northern European or American urban baseline. The 2025 reality of electric two-wheelers in Southeast Asia, of motorcycle taxis summoned by app in Lagos, of the e-bike as the fastest-growing personal transport category globally — none of that was in the frame. The telescope was pointed at the wrong cities.