Objective　Traffic　safety　is　closely　related　to　the　driver＇s　ability　to　obtain　visual　information.　Low　visibility　would　result　in　traffic　accidents.　This　study　aimed　to　explore　the　difference　between　meteorological　visibility　and　traffic　safety　visual　distance　in　foggy　areas　in　the　daytime,　and　analyze　the　difference　between　dynamic　visual　ability　and　static　visual　ability,　so　as　to　calculate　the　maximum　acceptable　speed　limit　that　meets　the　driver＇s　safety　visual　distance　requirement.　Methods　Visual　distances　under　different　visibility　conditions　were　collected　for　12　passenger　car　drivers　through　static　and　naturalistic　driving　visual　recognition　experiments.　The　power　function　relation　model　between　driver＇s　static　visual　distance　and　meteorological　visibility　was　established,　and　the　attenuation　rates　of　dynamic　visual　distance　at　different　driving　speeds　were　obtained.　Results　Traffic　safety　visual　distance　(TSVD)　gradually　grows　with　the　increase　of　visibility　and　finally　tends　to　be　stable　due　to　the　vision　limitation　of　the　human　eyes　under　good　weather　conditions.　The　drivers＇　visual　ability　decreased　while　driving　dynamically,　and　dynamic　TSVD　was　shorter　than　static　TSVD.　Conclusions　Traditional　meteorological　visibility　is　different　from　drivers＇　actual　TSVD,　but　there　is　a　correlation　between　them.　According　to　the　relationship　between　visibility　and　dynamic　TSVD,　the　maximum　recommended　speed　limit　values　under　different　visibility　levels　are　provided.　The　calculation　of　the　maximum　acceptable　speeds　under　specific　visibility　conditions　can　provide　a　technical　basis　for　road　construction　and　traffic　management.