Lane distribution factor pavement design software

Traffic analysis requires the evaluation of initial traffic volume, traffic growth, directional distribution, and traffic type. For these sections, truck traffic will tend to use the inner lanes more often than the twolane scenario, thus reducing the accumulation of loads on any one lane. Traffic is one of the most important factors in pavement design, and every effort should be made to collect accurate data specific to each project. If the designer anticipates the truck directional distribution to be different from. Lane distribution factors are used to reduce the estimated onedirection cumulative esals for sections that have three or more lanes in one direction. Pdf estimation of truck traffic inputs for mechanisticempirical. Traffic information for pavement design is available from the division of. Pavement design equations the aashto design equations as presented in the aashto interim guide for design of pavement structures, 1993 are to be used for the design of both flexible and rigid pavements.

The traffic data were then used for estimating pavement performance using a me pavement design software, namely, the texas mechanisticempirical thickness. Enter project details and values for lane distribution factor, directional distribution factor, no. Lane distribution factor ldf traffic engineering eng. Factor df and a lane distribution factor ldf, as expressed by the formula in figure 1. You can easily use the msavdf module of esurvey trans software for calculation of million standard axles and vehicle damage factor for the design of flexible pavement thickness.

Appendix c nhi05037 federal highway administration. A summary of information is presented in the report and compared with current design practice in texas, recommendations in the current aashto pavement design guide, predictions from the nchrp report 277 equations for trucklane distributions. For more information, refer to appendix d of aashto guide for design of pavement. This tool calculates the total number of esals that have or will traverse a pavement for the purposes of pavement analysis or design. The designer should then use a straightline average.

Traffic is one of the most important factors in pavement design, and every effort should be made to collect accurate. For dual three lane carriageway and dual four lane carriageway, the distribution factor will be 60 % and 45 % respectively. Flexible pavement designs 1993 flexible design equation log w18z. Lane distribution factors are constant with time and for all truck classes. Trucktraffic directional and lane distribution factors. The initial traffic in the year of completion in each direction is 150 cvpd and growth rate is 5%. Lane distribution factors are used to reduce the estimated one direction. Lane distribution factors for lanes with heaviest truck traffic volume versus number of lanes in. Austroads pavement design software, austpads conducts advanced mechanistic analysis of the responsetoload of road pavements. Pavement thickness design charts for the design of pavements to any traffic in the range of 10 msa, use chart 1 and for traffic in the range, 10 to 150 msa, use chart 2 of irc.