Human Factors Guidelines for Road Systems: Second Edition (2012) / Chapter Skim
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Pages 20-25
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4.1 Introduction The purpose of this chapter is to help highway designers and traffic engineers function as virtual road users. Not all road user situations are the same; some are more demanding than others.
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• A pedestrian may be walking along the shoulder and without looking turn in front of the approaching user. • Traffic may be entering the road from a side street or business establishment.
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Through road scanning the user is updating his or her information database for making decisions. This process can be expressed as follows: Where t = time Δt = sampling interval The real challenge then is to identify the changes that have occurred during the sampling interval (Δt)
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4.3 Use of Parts III and IV for Specifying Designs Parts III and IV are where explicit guidance statements are found. Before using the HFG for developing a solution to a problem, the HFG user must first study and understand the issues involved.
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Various problems are found at this location: • The alignment of the arterial and parkway ramp is not self-explaining. The first route marker shows Route 6 going to the right.
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• Because of the location of the signs and their close spacing, drivers have insufficient time to identify the important information. Also, the word signs have too many lines of information for users to read and interpret.
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