Abstract

PENA LINDARTE, Ricardo José. Analysing adjustment factors for using lanes at traffic-light-controlled intersections in Bogotá, Colombia.. Ing. Investig. [online]. 2010, vol.30, n.1, pp.5-10. ISSN 0120-5609.

This article was focused on analysing the lane use adjustment factor (f_LU) forming one of the eleven adjustment factors proposed in the current calculation methodology contained in the 2000 version of the Transportation Research Board’s (TRB) Highway Capacity Manual (HCM) for analysing traffic-light-controlled intersection capacity in terms of saturation intensity. A methodology was established when analysing the f_LU factor that considered operational conditions regarding traffic-light-controlled intersections in Bogota. Road traffic flows were analysed, including characterising road traffic based on statistical sampling, field data collection and analysis. The project proposed equations allowing reference values to be gathered for determining adjustment factors regarding lane use on roads in Bogota in relation to existing access typologies and road traffic volume for analysing trafficlightcontrolled intersections. For example, in the specific case of roads having direct double-lane access (2CCD), the basic equation was determined to be y=-3,03E-08X2+3,44E-05X+0,888988, having a 1.0 coefficient of correlation. The dependent variable y referred to the f_LU factor and the independent variable X was the volume of road traffic in mixed vehicles/hour. This equation was considered to be statistically relevant. A comparative analysis of the lane use adjustment factors estimated in the project is also presented and compared to the values recommended by the US Highway Capacity Manual. The project’s conclusions and recommenddations were thus sustained, validating the recommended factors summarised by the HCM and recommending that the results obtained from the project should be used in traffic-light-controlled design and planning projects.

Keywords : traffic-light-controlled intersection; saturation flow; service capacity; level.

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