Few studies report visibility distance in their published survey methods, although it is expected that surveys would not be conducted under conditions of limited visibility (less than the width of the belt-transect or the radius of the stationary-point-count).
It would also be of interest to study the visibility of pedestrian crossings and its relationship to the ability to detect bicyclists.
One study used visibility as a measure of particulate air pollution (Knöbel et al. 1995).
In the current study, endobronchial visibility and tumor size prevailed as significant predictors when several potential predictors were examined together.
In the present study the visibility of tumour xenografts with FRI increased substantially over the first 3 hours, showing a more than sixfold increase in CNR.
However, disruption to airports and rail and maritime transportation are also discussed, particularly as recent empirical studies of visibility reduction apply to all surface transportation modes.
Goel [24] studied the visibility of rail and road transportation systems that offer shipment and route choices to adjust transportation plans as situations change when supplies are in transit to minimize the total transportation and stock out costs.
This paper studies the visibility maintenance problem (VMP) for a leader follower pair of Dubins-like vehicles with input constraints and proposes an original solution based on the notion of controlled invariance.
