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Terminal 159 6.6.5 Mounting Mounting of signs can be synonymous with sign location in that they both relate to placement: vertical, horizontal, as well as in a plan view. The primary difference of mounting is the method used to physically install the sign. There are three primary categories: Overhead: Signs that are either suspended from the ceiling, mounted flush with the ceiling, or are located on an architectural soffit or wall. Freestanding: Signs that have their bases mounted directly to the floor surface using a mechan- ical fastening system. Wall: Signs that are mounted with the back of the sign to the wall using either an adhesive or mechanical fastening system. It is very rare that one mounting method will meet all installation conditions in a given airport. Therefore, in order to present the wayfinding information in as consistent manner as possible it is important to consider the variations in the architectural conditions when planning an airport's sign system. If the directional signs are illuminated, the mounting method must also consider the need to provide electrical service and make the necessary allowances. See Appendix D for detailed illus- trations with recommended clearances for these various sign types. 6.6.6 Safety Passenger safety is always a priority. Many of the safety issues are already addressed by code requirements, so it is not the purpose of this guideline to review each safety related condition and applicable codes. Airports should use available resources to research the codes associated with safety issues based on the AHJ (Authorities Having Jurisdiction). The airport surveys provided the following responses when asked about safety-related sign and wayfinding issues at the terminal: Escalator signing is always an issue--tendency is to add more signs. Signs for emergency exits, defibrillators, and fire extinguishers. Crossing traffic lanes to access taxi and bus pickup areas. In addition to these comments the United States uses the "EXIT" to identify emergency egress. Our surveys and research show that a large portion of the world uses the green field with a walking man with an arrow (Figure 6.66). Where the difference can become an issue is an International Arrivals area. Interviews with CBP personnel discussed the recurring issue with foreign passengers mistaking the emergency exits for the airport exit. They report that this is a daily problem that needs to be considered during the design process. 6.7 Sign Maintenance Wayfinding inside an airport terminal typically does not suffer from substantial degradation of sign surfaces over time like signs in an exterior application that are exposed to the environ- ment. What is important to maintain is the integrity of an airport's wayfinding system so that it keeps pace with changes in the airport. One of the myths of wayfinding is that once a new sign system is implemented the work is done. This is a false assumption. Airports are dynamic environments that are constantly changing. 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,