Abstract

GARCIA, Yasmany; ALTAMINA, Aníbal; ECHAVEGUREN, Tomás  and  MARCET, Juan. Acceleration and Deceleration Models on Horizontal Curves on Two-Lane Rural Roads in San Juan, Argentina. Rev Politéc. (Quito) [online]. 2017, vol.39, n.2, pp.41-50. ISSN 2477-8990.

Acceleration / deceleration models are necessary to develop the speed profiles for road geometrical design and consistency assessment. Typically an acceleration / deceleration value of 0,85 m/s2 is used. The state of the art shows that this value is not constant for all observed cases. Therefore, it is necessary to improve the models for estimating the acceleration / deceleration values. This paper presents a study of the acceleration / deceleration models of light-weight vehicles measured on three two-lane rural roads in San Juan, Argentina. These values were measured using a GPS logger and a high resolution camera mounted on the cars used in the experiment. The work studied two aspects, namely, the deceleration from the approach tangent to horizontal curves and acceleration from the horizontal curve to exit tangent. Data were collected at around 400 horizontal curves having radii shorter than 1 000 m, with approach and exit tangents measuring up to 2 000 m and longitudinal slopes below 5 %. Data were collected with 14 experimented drivers, who completed within 8-12 runs per curve. The experimental results shows that the acceleration / deceleration values obtained are not constant along the tangents and curves, and therefore decelerations are strongly dependent on the available length of the approach tangent and the radius of the curve, while the accelerations obtained depend mainly on the available exit tangent and the radius of the curve.

Keywords : acceleration; deceleration; horizontal curves; two-lane rural roads.

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