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(Automatic translation)

Effect of regularity of pavement road capacity on freeways and multilane highways Mexican

Rafael Gallegos Lopez
Chief Traffic Engineering Department and Coordinator of the Master of Science
Faculty of Civil Engineering (Mexico)

Alberto Mendoza Diaz
Armando Salas Velázquez

The procedures for estimating road capacity and service level assume the presence of good conditions bearing surface, which is evaluated by tools that measure the longitudinal profile of the road. The International Roughness Index (IRI) is the standard measure of evenness of a road. This index is the sum, in absolute value, of the vertical displacements along a distance interval, divided by its length.

The effect of evenness is incorporated by adapting the American methodology for freeways and multilane highways in the manual Highway Capacity of the United States, where the level of service is evaluated based on the hourly volume per lane, adjusted for various factors ; and the free stream velocity, from an ideal value, reduced according to the road conditions.

The adaptation is introduced to replace the factor speed reduction by gauge by another including both the bandwidth, as evenness. This new factor is generated from a series of point velocity measurements in Mexican experimental segments with different combinations of values ​​lane width and IRI; statistical analysis of this information is also presented. The impact of the amendment to estimate the level of service and vehicle operating costs, exemplified for some real cases.

IRI, evenness, Road capacity, Lane, Operation cost, Conservation.

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