The irregularity of the pavement surface governs the traffic-induced vibrations in road bridges,
but it is either ignored or simulated by means of ideal pavements that differ significantly from
real cases. This work presents a detailed dynamic analysis of a heavy truck crossing a 40-m
span composite deck bridge using on-site measurements of different existing road profiles, as well
as code-based ideal pavements. By activating or deactivating certain spatial frequency bands of
the pavement, it is observed that the ranges 0.2 - 1 and 0.02 - 0.2 cycles/m are critical for the
comfort of the pedestrians and the vehicle users, respectively. Well maintained roads with low
values of the displacement Power Spectral Density (PSD) associated with these spatial frequency
ranges could reduce significantly the vibration on the sidewalks and, specially, in the vehicle cabin.
Finally, a consistent road categorisation for vibration assessment based on the PSD of the pavement
irregularity evaluated at the dominant frequencies is proposed.