The Ethiopian Road Authority (ERA) included projects that demonstrate Otta seal technology to surface rural roads as part of its participation the Africa Community Access Programme Project (AFCAP). The Otta seal is an alternative to the more commonly used chip seal or other types of conventional surface treatments. The main objective was to demonstrate the potential for using this technology as a durable cost-effective surfacing option using local contractors and good quality gravel.
Two sections where identified for the demonstration. One section on the Tulubolo–Kela road through the village of Combel (1900 metres) and another in the village of Gerado on the Combolcha-Mekaneselam road (2900 metres). This construction report deals with the construction in Gerado village.
Otto, A. Development of Pavement Design Standards for Low-Volume Roads in Ethiopia. Combolcha Otta Seal Demonstration Site: Construction Report. (2013) 21 pp.