Cobbles said:
"In every case, and there are absolutly no exceptions, building extra road capacity increases demand."
Drivel - "ooooh look a new bypass, I must rush off and buy a car" - as if....
"We have to choose what type of city / Country we want, do you want Aberdeen to be more like Copenhagen or Zurich or more like Los Angeles?"
LA - the other 2 are dull as ditchwater.
"It just depends if you want to live in a city which is car dependant or not."
As 90% of the UK's cities have no space for any form of infrastructure other than roads, there's no other option.
The assertion that increase in road capacity increases demand are based on imperical research, I can't be bothered to go and look up the examples but if you want to please read the Dft Smarter Choices report.
http://www.dft.gov.uk/stellent/groups/dft_susttravel/documents/page/dft_susttravel_038456.pdf
Better still buy a copy of Lynn Slomans Car Sick, a very readable analysis of government road policy which has caused car dependance available on Amazon.
Why does a new bypass increase demand?
1. There is a certain latent demand for road capacity, people who would travel by car choose other means or do not travel if it is not essential bcause they know there is congestion, when a new bypass is built these trips are then able to be made more easily.
2. Shorter journey times enabled by the initial honeymoon period after a bypass encourage people to travel further to work, move to cheaper or bigger houses further away or accept work further away.
3. A bypass opens up land for development, companies relocate to be close to the bypass, retail parks, warehouses etc, usually moving out of town centres where public transport links are good, but car acess is limited and expensive.
4. A combination of reduced choice for alternatives in longer term caused by the bypass, local shops closing etc, means that yes car ownership does increase.
The net results of these changes is a further move towards car dependancy.
Copenhagen and Zurich dull? What about Amsterdamn?
I stayed in LA for a couple of weeks for work, and although I accept that there are some facinating creative people there I couldn't handle the fact that I had to drive or be driven hours each day from shopping mall to restaurant to work to home, with so few places to walk. Phoenix Arizona is an even better example of a dull car dependant city.
Finally you seem to keep mixing cause and symptoms. There is no space because car dependant systems are so space intensive, each car on the roads takes up the space of an average house with garden, driving, parking etc. This is the main problem, we have no living space in cities, no safe areas for kids to play or cycle lanes beacuse we need all the space for cars. Massivly inefficient!