Acknowledgements
We would like to forward our gratitude to Jimma University, college of
Public Health and Medical Sciences. We thank also the supervisors, data
collectors and respondents, Mekelle office of road, transport and industry.
We are grateful to Ms Laura Sminkey, Mr. S. M. Sohel Mahmud, Afera Berhe,
Mr. Tesfay Ebuy and Hailemariam who has helped as in doing this
manuscript.