Speed Guidance and Trajectory Optimization of Traffic Flow in a Low-Visibility Zone of a Highway Segment within Multiple Signalized Intersections

Table 1

Low-visibility speed limit.

Visibility (m)	Calculated value (km/h)	Theoretical recommended value (km/h)	Utah speed limit (km/h)
<50	Suggest road closure	No entry	40
50∼100	41∼66	40∼65	50
100∼150	66∼87	65∼85	65
150∼200	87∼104	85∼100	80
>200	Normal driving	Normal driving	Normal driving

Note: the calculated value and the theoretical recommended value do not consider the speed limit of the highway segment.