Yes, I had a feeling that you would bring up hydrogen! Producing it, and producing it cheaply, may well be a bigger problem than building a car that runs on it.
Even if we suppose that a car running on hydrogen can be produced cheaply, is safe, and so is the fule that it runs on, that still doesn't mean that cars and lorries are going to be as prevalent as they are today.
It's comforting for all of us car owners to believe that we wills till have the indivudal freedom and flexibiltiy that the car gives us, but I think we have to look at this realistically.
OK - you've chosen to overlook my comment about technology, so let's give some worked examples.
Before 1950, nuclear power stations didn't exist. Now 60 years later they generate 15% of the world's electricity.
In 1950 the first jet powered passenger aircraft (the Comet) had flown a handful of times. It seated fewer than 50 people. Compare that with the Airbus A380 which can carry up to 850 and has far greater range than the Comet did.
In 1959 you could buy a new Ford Anglia 105 with a 1 litre engine which would have barely reached 60mph and probably did 30mpg. A new Focus with a 1.6 diesel engine will do double that speed and return c 50mpg.
In the 1960s Liquid Hydrogen was used to send man to the moon, now some 40 years later we're looking at using it to power cars.
Necessity is the mother of invention. Getting a cost effective way to produce hydrogen will be found and it will address many issues along the way.
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Actually the Conservative government before scrapped a lot of road building too.
The problem with road transport energy consumption is the sheer scale of it, it's not very easy to just switch it over to non-oil based transport fuels. Rail is quite a minor consumer of primary energy, and some capacity improvements can be had quite cheaply - often simply adding coaches on trains.
However I do actually wonder if the road and air lobbies do hang about this forum, there are far too many far too keen on promoting other modes on a rail forum.
Actually we need a decent multi-modal solution, and just sometimes rail is better at going between A and B.
True - but the Conservative government suspended many schemes as there was an economic downturn in the early 1990s. Had they won in 1997 and enjoyed the economic boom Labour did, then some of those schemes would almost certainly have been resurrected.
I agree that for some journeys rail makes sense e.g. getting into London / Manchester. What I don't agree with is that you can force people to make change - they only resent it if you do - and that rail is the only solution.
And, as I've pointed out before, some journeys don't work particularly well on public transport and the investment needed to make them viable makes no practical sense.
As for the moving from oil-based to non-oil based. That could happen over 20 years once a viable energy source is on-stream. Your average family car has a life of circa 12 years / 150,000 miles. Commercial vehicles tend to have a shorter life. Now, that kind of changeover time is realistic and is comparable with the rail network's move from steam to diesel / electric in the 50s and 60s.
I can assure you I'm not a member of any particular transport lobby. I have an interest in all things engineering (from a personal interest point of view).