[1] Ding Q J, Bao Y X, Yuan C S et al. Occurrence pattern and local characteristics of dumpling fog events on Shanghai =Nanjing expressway[J]. Scientia Meteorologica Sinica, 33, 634-642(2013).

[2] Li X L, Tang B M, Zeng C. Transient analysis of the driving behavior in the dumpling fog sections of expressway based on catastrophe theory[J]. China Journal of Highway and Transport, 31, 78-87(2018).

[3] Wang J L, Liu X L, Liu J C et al. A study on visibility observation at nighttime using digital photography visiometer system[J]. Acta Electronica Sinica, 46, 1306-1311(2018).

[4] Miao M. Survey on video-based visibility detection method[J]. Modern Electronics Technique, 35, 72-75(2012).

[5] Gao J J, Tian H, Wu H et al. A visibility detection method using daytime road images based on brightness contrast and dark channel prior principle[J]. Meteorological Science and Technology, 47, 386-396(2019).

[6] Wang J L, Liu X L, Lei M et al. Digital photography visiometer system and comparative experiment[J]. Acta Electronica Sinica, 42, 2298-2302(2014).

[7] Wang J L, Liu X L, Lei M et al. Research on new automatic visibility observation system[J]. Journal of Electronic Measurement and Instrument, 27, 596-603(2013).

[8] Kwon T M. Final report on signal and image processing for road condition classification[R](2002).

[9] Duynkerke P G. Radiation fog: A comparison of model simulation with detailed observations[J]. Monthly Weather Review, 119, 324-341(1991).

[10] Koschmieder H. Theorie der horizontalen sichtweite[J]. Beiträe zur Physik der Atmosphäre, 12, 171-181(1924).

[11] Wu W, Li B, Yang X et al. Visibility detection algorithm based on optimization of squared differences upon apparent luminance of roads[J]. Journal of Electronics & Information Technology, 36, 2412-2418(2014).

[12] Kwon T. Atmospheric visibility measurements using video cameras: Relative visibility[R](2004).

[13] Wu H. Temporal and Spatial Simulation of Low Visibility Video Surveillance on Freeway[D](2018).

[14] Hallowell R G, Matthews M, Pisano P A. Automated extraction of weather variables from camera imagery[C], 1-13(2005).

[15] Chen X T, Lu C H, Zhang Y Jet, al. Design of daytime visibility algorithm for digital camera visibility instrument[J]. Journal of Electronic Measurement and Instrument, 27, 353-358(2013).

[16] Chen Z Z, Zhou Q K, Chen Q M. Video visibility detection algorithm based on wavelet transformation[J]. Chinese Journal of Scientific Instrument, 31, 92-98(2010).

[17] Chen Z Z, Chen Q M. Video contrast visibility detection algorithm and its implementation based on camera self-calibration[J]. Journal of Electronics & Information Technology, 32, 2907-2912(2010).

[18] Zhang X, Li B, Chen Q M. PTZ visibility detection algorithm based on luminance characteristic and its implementation[J]. Chinese Journal of Scientific Instrument, 32, 381-387(2011).

[19] Liu Y, Jiang T, Li J M. Study on highway video surveillance image algorithm based on Markov algorithm[J]. Computer Measurement & Control, 25, 60-63(2017).

[20] An M W, Chen Q M, Guo Z L. Visibility detection method and system design based on traffic video[J]. Chinese Journal of Scientific Instrument, 31, 1148-1153(2010).

[21] Guan K, Qi S M, Liang J. Visibility measurement of highway based on digital image processing technology[J]. Journal of Chang'an University (Natural Science Edition), 30, 89-92(2010).

[22] Li Y R. Design of Highway Fog Early Warning System Based on Video Analysis Technology[D](2018).

[23] Hu P, Yang X D. An algorithm for fast detecting expressway visibility[J]. Journal of Highway and Transportation Research and Development, 34, 115-122(2017).

[24] Tong C. Research and System Implementation of Fog Visibility Detection Technology Based on DSP[D](2014).

[25] Li J, Ge J Q, Chen Q M. Visibility detection algorithm for road video[J]. Computer Engineering, 35, 175-177(2009).

[26] Lu W T, Yang S C, Liu Y F et al. Measuring meteorological visibility based on digital photography-dual differential luminance method and experimental study[J]. Chinese Journal of Atmospheric Sciences, 28, 559-568(2004).

[27] Wang J L, Cheng C L, Xu X F. Comparison experiment of instrument system for measuring visibility by digital camera method[J]. Meteorological Science and Technology, 30, 353-357(2002).

[28] Wang J L, Liu X L, Gao W F et al. Control circuit design of digital photography visiometer system[J]. Meteorological Science and Technology, 34, 633-637(2006).

[29] Xiang W S. Visibility Estimation Using Traffic Surveillance Video[D](2014).

[30] Zhou J P, Miao K C, Jiang C et al. Image characteristics of dense fogs on expressway at night and its recognition[J]. Meteorological Science and Technology, 47, 29-34(2019).

[31] Liu J L, Liu X L. Fog detection algorithm based on contrast model of video image[J]. Optoelectronic Technology, 35, 91-95(2015).

[32] Wang J M. Research on Surveillance Video Analysis-Based Visibility Detection and Early Warning System for China Highway[D](2016).

[33] Nie K, Wang J L, Lei M et al. Comparison of visibility in rainfall and haze-fog weather in Beijing using digital photographic visibility system[J]. Journal of Meteorology and Environment, 36, 28-35(2020).

[34] Wang C, Shang J Y. Experimental study of different lighting penetration effects on driving safety in rain and fog[J]. Science Technology and Engineering, 17, 313-319(2017).

[35] Lu Z L, Yang C F, Zheng Z J et al. Study on warning level of expressway dense fog[J]. Meteorological and Environm-ental Sciences, 45, 103-111(2022).

[36] Xu X, Yin X C, Li Y et al. Visibility measurement with image understanding[J]. Pattern Recognition and Artificial Intelligence, 26, 543-551(2013).

[37] Cui C X, Bao Y X, Yuan C S et al. Study on temporal and spatial occurrence pattern of fog on the coastal expressway of Jiangsu Province[J]. Science Technology and Engineering, 15, 6-20(2015).