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 the
aim of improving the design of such roads in Tanzania. The study was conducted in Dar es Salaam and Morogoro
regions in Tanzania where data for LVSRs were collected from primary and secondary sources in the two regions. The
study found that by using an improved pavement design method specifically meant for LVSRs results in cost savings for
LVSRs of up to 51% compared with the conventional method of pavement design in Tanzania. The study recommends
that the pavement design method for lightly trafficked sealed roads in southern Africa developed by Transport Research
Laboratory, which was found to be most cost-effective, be used to design (or develop a procedure for design of) LVSRs
in Tanzania and that the roads be preferably sealed with Otta seal or Surface dressing. The study also recommends that
LVSRs in Tanzania be defined by a maximum traffic volume of 400 vpd.