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Airport Toolbox 35 Source: http://www.naco.faa.gov/pdfs/ec_77_15JAN2009.pdf Figure 5-3. Pavement strength indicator from FAA airport facility directory. Runway Protection Zone (RPZ) is trapezoidal in shape and centered on the extended runway centerline beginning 200 feet beyond the end of the hard surface area usable for takeoff or landing 5.2.7 Runway Lighting Runway lighting can be divided into edge lighting and approach lighting. Runway edge lights are placed along the edge of a runway, generally at 200-ft intervals. Such lights are designed to help pilots identify the edge of the surface prepared for landings and takeoffs. Runway lighting is required to provide 24-hour accessibility and support nighttime instrument approaches. There are three types of runway edge lights: 1. HIRL (high-intensity runway lights). This is the most intense runway edge lighting system and is most often found at high-activity airports having wider runways and precision instrument approaches. 2. MIRL (medium-intensity runway lights). This is the most common type of runway edge light- ing at most general aviation airports and is used to support an instrument approach. 3. LIRL (low-intensity runway lights). This type is most common in lower activity airports with- out instrument approaches. MIRL is the most common lighting system at GA airports and would be adequate for airports serving the new generation GA aircraft discussed in this guidebook. There are also lighted visual approach aids to help pilots locate the runway environment and establish a descent to a landing. Runway End Identifier Lights (REILs) are flashing strobe lights installed outboard of the end of the runway to help pilots locate the end of a runway. Precision Approach Path Indicators (PAPIs) or Visual Approach Slope Indicators (VASIs) provide a visual glide slope indication to the pilot through a series of red or white lights.