In this paper gusty wind characteristics produced by the effect of a local topographical feature are discussed in connection with the driving safety of road vehicles. The characteristics are derived from both field observations and wind-tunnel experiments. The field observations were carried out to clarify the wind flow pattern under the present full-scale topographical conditions and to allow comparison with the results of wind-tunnel experiments. The main purpose of the wind-tunnel experiments was to determine effective measures to improve the driving safety with respect to wind by modifying the topographical features. From the study it was found that a slight modification of the topographical features could improve the wind flow pattern in terms of the driving safety of road vehicles for particular wind conditions.