Constructing pedestrian level of service based on the perspective of visual impairment personRuss Bona Frazila, Febri Zukhruf, Cavin Ornando Simorangkir and Jzolanda Tsavalista BurhaniMATEC Web Conf., 270 (2019) 03009DOI: https://doi.org/10.1051/matecconf/201927003009