Visual signal is speedy and requires sunlight hours with no obstructions.
<h3>What is visual obstruction?</h3>
Visual obstruction is the blocking of views or foreshortening of views.
Visual obstruction is defined via peripheral visible area testing regular with the advocated documentation requirement.
<h3>When measuring visual obstruction the usage of a Robel pole which band is recorded?</h3>
1994; 'Robel pole': Best et al. 1998) with alternating 1 dm bands painted darkish and light. The lowest decimetre mark visible on the pole was once recorded as the obstruction measurement. Visual obstruction is commonly used as a measure of cover density (Higgins et al.
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