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90 Wayfinding and Signing Guidelines for Airport Terminals and Landside Treatment Category Description Crosswalk This category encompasses standard crosswalk markings and pedestrian crossing signs, as opposed to unmarked crossings. Enhanced This category includes those devices that enhance the visibility of the crossing location and pedestrians waiting to cross. Warning signs, markings, or beacons in this category are present or active at the crossing location at all times. Active Also called "active when present," this category includes those devices designed to display a warning only when pedestrians are present or crossing the street. Red This category includes those devices that display a circular red indication (signal or beacon) to motorists at the pedestrian location. Figure 5.11. Table of possible treatments to enhance pedestrian safety. Flag Mount--signs that are mounted perpendicular to the attachment surface, usually on a wall and/or column, and attached using a mechanical fastening system. Post Mount--signs that are mounted directionally to a ground-mounted single or double post structure using a mechanical fastening system. Wall Mount--signs that are mounted with the back of the sign to the wall using a mechani- cal fastening system. Freestanding--signs that have their bases mounted directly to the ground/finished floor using a mechanical fastening system. See Appendix C for graphic illustrations with recommended clearances for various sign types and locations. 5.6.4 Safety Specific research to analyze pedestrian and vehicle interaction along terminal curbsides at air- ports has not been compiled, but research has been conducted to analyze and make safety rec- ommendations for pedestrians at locations with high volumes of vehicles and/or pedestrians at other locations38. Once an engineering study is completed, recommended treatments for safety improvements can be determined. These treatments fall into one of the four categories described in Figure 5.11. 5.7 Sign Maintenance One of the myths of wayfinding is that once a new wayfinding system is implemented the work is done. This is a false assumption. Airports are dynamic environments that are constantly chang- ing. In order to perpetuate the integrity of the wayfinding program, a systematic maintenance program must be implemented as an integral part of standard airport operations. A strategic maintenance program is the key to perpetuating a well-planned wayfinding program. Standard procedures should be in place to address the impact of changes to airport operations, including clear update policies and scheduled maintenance reviews (quarterly, semi-annually and annually). Clearly defined procedures will help address issues such as the following: Addition of a new terminal, Re-designation or re-configuring a terminal, Adding signs, Deleting signs, and Temporary signs.