IMPROVING THE DESIGN OF LOW VOLUME SEALED ROADS IN TANZANIA

Abstract

The main objective of the study was to identify appropriate road designs for Low Volume Sealed Roads (LVSRs) with theaim of improving the design of such roads in Tanzania. The study was conducted in Dar es Salaam and Morogororegions in Tanzania where data for LVSRs were collected from primary and secondary sources in the two regions. Thestudy found that by using an improved pavement design method specifically meant for LVSRs results in cost savings forLVSRs of up to 51% compared with the conventional method of pavement design in Tanzania. The study recommendsthat the pavement design method for lightly trafficked sealed roads in southern Africa developed by Transport ResearchLaboratory, which was found to be most cost-effective, be used to design (or develop a procedure for design of) LVSRsin Tanzania and that the roads be preferably sealed with Otta seal or Surface dressing. The study also recommends thatLVSRs in Tanzania be defined by a maximum traffic volume of 400 vpd.