shebl, Mohamed, Mohamed El-Tokhey, Tamer Fathy, Yasser Mogahed, and Mohamed El-Habiby. 2018. “Distance Measurement Using Proximity Sensor in Pedestrian and Bicycle Navigation”. International Journal of Engineering & Technology 7 (4): 4266-70. https://doi.org/10.14419/ijet.v7i4.15999.