First, a driver model is presented which, conceived as an information proce
ssing unit, reproduces human driving behaviour and controls the vehicle up
to its physical limits. Second, a new issue is introduced in the subjective
assessment of vehicle handling characteristics. It is shown that subjectiv
e ratings are essentially based on the effort a driver has to summon up to
successfully solve the driving task. Combining the driver model and the eff
ort issue generates a dynamic rating driver model. This rating driver model
may be used together with vehicle models in simulation for vehicle handlin
g design.