316:". However, according to Downs, the link between average speeds on public transport and private transport applies only "to regions in which the vast majority of peak-hour commuting is done on rapid transit systems with separate rights of way. Central London is an example, since in 2001 around 85 percent of all morning peak-period commuters into that area used public transit (including 77 percent on separate rights of way) and only 11 percent used private cars. When peak-hour travel equilibrium has been reached between the subway system and the major commuting roads, then the travel time required for any given trip is roughly equal on both modes."
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Following the position, it is not generally concluded that new roads are never justified but that their development needs to consider the whole traffic system, which means understanding the movement of goods and people in detail as well as the motivation behind the movement.
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The position, however, is not confined to private transport. Mogridge, a
British transport researcher, concluded also that all road investment in a congested urban area will have the effect of reducing the average speed of the transport system as a whole: road and
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consequently fills these roads. Speed gains from some new roads can disappear within months, if not weeks. Sometimes, new roads help to reduce traffic jams, but, in most cases, the congestion is only shifted to another junction.
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Mogridge, M. J. H., Holden, D. J., Bird, J. and Terzis, G. C. "The Downs–Thomson paradox and the transportation planning process". International
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such as congested roads in cities and on motorways. It can also be used to explain the success of schemes such as the
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The Downs–Thomson
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Estimating the influence of public policy on road traffic levels in greater London
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in the transport literature, and was posited as the "Iron Law of
Congestion" by
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La conjecture de MJH Mogridge : test sur l’agglomération de Lyon
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Still stuck in traffic: Coping with peak-hour traffic congestion
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The position is often used to understand problems caused by
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Travel in towns: jam yesterday, jam today and jam tomorrow?
503:(PDF), Cahiers Scientifiques du Transport (30), 1995.
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273:(Mogridge, 1990). It is generally referred to as
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448:"The Road Network Paradox"
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