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An introduction is given to our psychophysical response and valence theory of choice behaviour, since the risk-adaptation theory derives from that theory as an application. Risk-adaptation theory assumes that road users implicitly evaluate their risks by oppositely oriented, single-peaked valence functions of arousal and fear sensations as dependent aspects of risks in road traffic. Due to this dependence...
The macroscopic trend of road traffic fatalities in any motorized country is described and predicted by the product of rather well fitting functions of time for the exponential decay of fatality risk per unit of traffic volume and the S-shaped Gompertz function of traffic volume growth. This product defines a single-peaked development of road traffic deaths, where its peak reaches earlier the sooner...
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