Abstract
The results relative to an experimental investigation regarding the speeds implemented, on motorways, in free flow conditions, are presented. The results demonstrate that the maximum speed, in free flow conditions, is to be found on flat straight stretches, with a section width of around 11 meters. In such conditions the FFS is found to be at values of around 131km/h. Such a speed tends to decrease when some of these conditions vary. In particular the dimensions which influenced the FFS are: slope, curvature, tortuousness and the width of the section. The lowest FFS value was encountered in ascent(+4,5%), on a straight stretch, section width of around 9 meters and tortuousness degree equal to 21 degrees/Km; in these conditions the FFS is found to be around the value of 105km/h. These results consented the forming of the first consideration for the identification o the structure of the model for speed estimation, implemented by drivers, on the motorway in free flow conditions. It is believed that this information could be extremely useful in the evaluation of the level of service (LOS) in the motorway field.
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