Transcription of ELEMENTS OF DESIGN - Louisiana
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ELEMENTS OF DESIGN - Louisiana
ELEMENTS OF DESIGN 4-1. CHAPTER 4. ELEMENTS OF DESIGN . SIGHT DISTANCE. The ability to see ahead is of utmost importance for safe and efficient operation of a highway vehicle. Sight distance can be defined as the length of highway visible to a user of the highway. The four types of sight distances discussed in this chapter are: Stopping Sight Distance: the distance required for a vehicle to stop once the driver sees the object necessitating the stop. Passing Sight Distance: the distance required to pass a vehicle (applicable only to two-lane highways). Decision Sight Distance: the distance needed to make complex or instantaneous decisions, where information is difficult to perceive or when unexpected or unusual maneuvers are needed. Intersection Sight Distance: the distance provided when feasible at intersections to enhance the safety of the facility.
a highway, keeping in mind design constraints such as right-of-way and environmental impacts. Chapter 3 of the AASHTO Green Book contains additional discussion of decision sight distance. 4.1.4 Intersection Sight Distance Intersection Sight Distance (ISD) is the distance that allows a driver stopped at an intersection to:
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