Bwala, Ezekiel. Buba and Amosun, Semiu Taiwo. “Intensive Survey on the Use of Road Traffic Signs and Observance of Traffic Rules and Regulations by Commercial Motorists in Jimeta and Yola Metropolitan, Adamawa State, Nigeria”. NIPES - Journal of Science and Technology Research, vol. 3, no. 3, Aug. 2021, doi:10.37933/nipes/3.3.2021.17.