https://hdl.handle.net/10259/8930 2026-04-20T00:24:55Z 2026-04-20T00:24:55Z Pérez Acebo, Heriberto Gonzalo Orden, Hernán Rojí, Eduardo https://hdl.handle.net/10259/8937 2024-04-16T00:05:21Z 2019-10-01T00:00:00Z

Skid resistance prediction for new two-lane roads Pérez Acebo, Heriberto; Gonzalo Orden, Hernán; Rojí, Eduardo Skid resistance is a vital issue in pavement management, mainly in relation to road safety; hence, road agencies must assure a minimum friction level of their road networks. The regional government of Biscay (Spain) uses a sideways force coefficient routine investigation machine to assess the present pavement surface condition and to allocate the available funding better. The aim of this paper is to develop a deterioration model to predict the minimum skid resistance in the rural two-lane bituminous roads of Biscay by means of the factors that affect it. In an attempt to include all possible variables that could influence the friction, 23 sections of new roads in Biscay, constructed over the last 25 years, were selected, with different pavement structures (flexible and semi-rigid pavements), ages, surface layers and traffic volumes; a multiple linear regression was then performed. It was concluded that only the average annual daily traffic of heavy vehicles and the required minimum polished stone value of aggregates reflect their importance and, consequently, they are the only variables introduced in the model. The age of pavement, total thickness of bituminous layers and average annual daily traffic of all vehicles showed no influence and were discarded. The proposed model can forecast future skid resistance.

2019-10-01T00:00:00Z Pérez Acebo, Heriberto Gonzalo Orden, Hernán Findley, Daniel J. Rojí, Eduardo https://hdl.handle.net/10259/8936 2024-04-16T00:05:20Z 2020-11-01T00:00:00Z

A skid resistance prediction model for an entire road network Pérez Acebo, Heriberto; Gonzalo Orden, Hernán; Findley, Daniel J.; Rojí, Eduardo This article predicts the available minimum skid resistance in the road network of Biscay (Spain) with data collected in the summer season when friction values are at a minimum. Firstly, it was observed that pavement structure does not influence skid resistance. Therefore, roadway segments with available data about the surface layer of single or double carriageway roads were analyzed. Two models were developed: 1) short model with only the surface material, average annual daily traffic, and number of lanes (no pavement history required) and 2) a long model which adds the required Polished Stone Value to improve the prediction. These models can help road agencies to identify the roads where lower skid resistance values are more probable to be obtained to focus their attention and efforts.

2020-11-01T00:00:00Z Pérez Acebo, Heriberto Otxoa Muñoz, Xabier Marquina Llaguno, Mikel Gonzalo Orden, Hernán https://hdl.handle.net/10259/8935 2024-05-17T09:38:16Z 2021-02-01T00:00:00Z

Analysis of the efficiency of traffic lights turning red in case of exceeding speed limit Pérez Acebo, Heriberto; Otxoa Muñoz, Xabier; Marquina Llaguno, Mikel; Gonzalo Orden, Hernán Due to the presence of various traffic calming measures (TCM) and traffic lights in urban areas, the speed of vehicles is maintained low. Nevertheless, a problem arises in the frontier between urban and non-urban areas because drivers must adapt their speed and behavior to new conditions. This risk becomes even greater in rural roads that penetrate small villages without a bypass and with a short urban segment, since drivers do not normally speed down in these segments. Various measures can be installed, but traffic lights that turn red if the speed limit is exceeded is not usually considered as a TCM in the literature. Therefore, this paper aims to analyze the efficiency of traffic lights turning red in case of exceeding speed limit. The village of ´Abalos in Spain was selected for this research, with an urban area of 630 m and this type of traffic lights in both directions. Results showed that drivers do not respect the speed limit - and hence, the red light - when they are placed separately. However, if they are placed next to a crosswalk, their effect is increased. Consequently, it is recommended to place these traffic lights with a crosswalk to reinforce the efficiency of both TCMs.; Debido a la presencia de varias medidas de calmado de tráfico (MCT) y semáforos en zonas urbanas, la velocidad de los vehículos se mantiene baja. No obstante, un problema aparece en la frontera entre áreas urbanas y no urbanas porque los conductores deben adaptar su velocidad y comportamiento a nuevas condiciones. Este riesgo se vuelve incluso mayor en las carreteras interurbanas que penetran en pequeñas poblaciones sin circunvalación y con un corto tramo urbano, pues normalmente los conductores no reducen su velocidad en estos tramos. Varias medidas pueden ser instaladas, pero los semáforos que se ponen rojos si se sobrepasa el límite de velocidad no suelen considerarse como MCT en la literatura. Por lo tanto, el objetivo de este artículo es analizar la eficacia de los semáforos que se ponen rojos en caso de exceder el límite de velocidad. La población de Abalos en España fue seleccionada para esta investigación, con un área urbana de 630 m y con este tipo de semáforos en ambas direcciones. Los resultados muestran que los conductores no respetan el límite de velocidad - y por tanto, el semáforo en rojo - cuando son colocados por separado. Sin embargo, si son colocados junto a un paso de peatones, se aumenta su efecto. En consecuencia, se recomienda disponer este tipo de semáforos junto con un paso de peatones para reforzar la eficacia de ambas MCT.

2021-02-01T00:00:00Z Linares Unamunzaga, Alaitz Gonzalo Orden, Hernán Díaz Minguela, Jesús Pérez Acebo, Heriberto https://hdl.handle.net/10259/8934 2024-04-17T06:13:34Z 2018-06-01T00:00:00Z

New Procedure for Compacting Prismatic Specimens of Cement-Treated Base Materials Linares Unamunzaga, Alaitz; Gonzalo Orden, Hernán; Díaz Minguela, Jesús; Pérez Acebo, Heriberto Understanding the long-term behaviour of cement-treated base materials is a key factor to improve its design and obtain environmentally friendly pavement base materials. Their characterization requires manufacturing prismatic specimens. However, various authors highlight the absence of standardized test methods for fabricating beams in the field and laboratory, which is not an easy task because it depends on the qualification and experience of the testing team. The aim of this paper is to present a new device and procedure for compacting prismatic specimens of cement-treated base materials. In this research, it was used for compacting soil-cement to simulate its performance as a road base material. This device employs elements that are generally available in a concrete laboratory test, such as a vibrating table or prismatic moulds. Once the procedure was established, and in order to verify its suitability, flexural and compressive strength tests were carried out. Results showed that the values obtained were consistent with this material and, despite the heterogeneity of the material, specimens from the same batch provided similar results and, hence, validated the compaction process. This new compacting procedure can improve understanding of the long-term performance of cement-treated materials from flexural and fatigue tests.

2018-06-01T00:00:00Z