Zhixin SongTongyu ZhuDongdong WuSuai LiusAn Approach to Estimate Traffic Speed Based on Cellular Network Signaling Data on Highways.914-9212014ICTAIhttps://doi.org/10.1109/ICTAI.2014.139https://doi.ieeecomputersociety.org/10.1109/ICTAI.2014.139conf/ictai/2014db/conf/ictai/ictai2014.html#SongZWL14