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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机译：给出了有关在自由流动条件下在高速公路上实施的速度的实验研究的结果。结果表明，在自由流动条件下，最大的速度将在平坦的直线段上找到，截面宽度约为11米。在这种情况下，FFS的值约为131 km / h。当这些条件中的一些发生变化时，这种速度趋于降低。特别地，影响FFS的尺寸是：斜率，曲率，曲折和截面的宽度。直线延伸时，上升（+ 4,5％）时遇到最低的FFS值，截面宽度约为9米，曲折度等于21度/ Km;在这些条件下，FFS被发现约为105km / h。这些结果同意了驾驶员在自由流动条件下在高速公路上实施的速度估算模型的结构识别的第一个考虑因素的形成。人们认为，该信息对于评估高速公路领域的服务水平（LOS）可能非常有用。
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