Longitudinal Acceleration Models for Horizontal Reverse Curves of Two-Lane Rural Roads

Abstract

The operating speed profile models adopt acceleration and deceleration as constant values obtained from kinematic models, assuming that the operating speeds between two consecutive sections are not spatially correlated. Existent research shows that acceleration and deceleration in horizontal reverse curves (HRC) depend on the tangent length and curve radii. In this paper, accelerations/decelerations-geometry models for light cars are proposed. The models are based on the data obtained in-field with a 10 Hz GPS under favourable traffic, weather, and pavement condition to isolate the effect of road geometry over the speed changes. The models were calibrated using the 95th percentile of acceleration probability density function (pdf) obtained section to section in the HRC. It was found that the acceleration and deceleration pdf follow the Burr distribution. Therefore, a Box–Cox transformation is needed to properly calibrate acceleration-geometry models. The models obtained confirmed that accelerations and decelerations depend on the radius of entrance and departure curves of the HRC. The results contribute to better understanding of the acceleration/deceleration patterns of light cars and to enhancing operating speed models in the HRC.

Speed development at freeway curves based on high frequency floating car data

“…In the last decade several studies have generated speed profiles using driving simulators (Bella, 2014;Montella, Galante, Imbriani, Mauriello, & Pernetti, 2014;Montella, Galante, Mauriello, & Aria, 2015;Wang, Guo, & Tarko, 2020), usually to research specific elements of the road (Bobermin, Silva, & Ferreira, 2021). Other studies used instrumented vehicles to analyse speed profiles (Altamira, García Ramírez, Echaveguren, & Marcet, 2014;Cafiso & Cerni, 2012;Cafiso & La Cava, 2009;Echaveguren, Henríquez, & Jiménez-Ramos, 2020;Hashim, Abdel-Wahed, & Moustafa, 2016;Malaghan, Pawar, & Dia, 2020Montella, Pariota, Galante, Imbriani, & Mauriello, 2014;Nama, Sil, Maurya, & Maji, 2020). These methods usually have low sample sizes of observed curves or participants and suffer from participant bias.…”

Modelos de velocidad de operación de carreteras rurales en terreno llano en Costa Rica

“…En los últimos años, en muchos países se ha evaluado la seguridad vial a partir del análisis de la consistencia del trazado (Abebe & Belayneh, 2018;Almeida et al, 2018;Echaveguren et al, 2020;Fitzpatrick et al, 2000;García et al, 2012;Kiran et al, 2017;Li et al, 2017;Llopis-Castelló et al, 2020;. El análisis de la consistencia del trazado permite verificar si las condiciones geométricas de la carretera generan pequeños diferenciales de velocidad entre elementos consecutivos, ya sea curvas y rectas en horizontal o acuerdos, tanto cóncavos como convexos.…”

“…Investigadores como Wilches et al (2020), Xu, Lin y Shao (2017) y Xu, Lin, Wang, et al (2017) destacan la importancia del terreno y el diseño geométrico del trazado para obtener los modelos de perfil de velocidad. Otros como Echaveguren et al (2020) resaltan la complejidad geométrica del trazado como un factor determinante en la variación de la velocidad de operación.…”