  The temperature dependences of the galvanomagnetic and thermoelectric
transport coefficients within a generic hot-spot model are reconsidered.
Despite the recent success in explaining ac Hall effect data in
YBa_{2}Cu_{3}O_{7}, a general feature of this model is a departure from the
approximately universal temperature dependences observed for normal state
transport in the optimally doped cuprates. In this paper, we discuss such
systematic deviations and illustrate some of their effects through a concrete
numerical example using the calculated band structure for YBa_{2}Cu_{3}O_{7}.
