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52 Wayfinding and Signing Guidelines for Airport Terminals and Landside
critical stakeholders (such as law enforcement, security, transportation, and public safety) can
be used to establish these agreed upon criteria.
· Protocols or hierarchy for prioritizing messages and determining which messages are to be
displayed.
· Geographic area over which the information is to be displayed, to be determined in coopera-
tion with public safety and security agencies.
· Identification of the circumstances under which transportation-related messages, such as lane
closures, fog alerts, detours, or other messages that may be needed because of dangerous travel
conditions in the immediate vicinity, would preempt emergency or security alert messages.
· The criteria that would cause the discontinuation of use of the CMS if the emergency or secu-
rity alert message creates an adverse traffic impact such as queues, markedly slowing traffic, etc.
· Methodology for developing and displaying messages that are appropriate for CMS display
including, but not limited to, standard message sets. Agencies should follow the recommended
national CMS practices related to the development, use of text, manner in which messages
should be displayed, human factors related to understandability of the messages, and how
CMS are operated.
3.7 Sign Maintenance
In 2008, FHWA passed rules concerning minimum sign retroreflectivity values. These are listed
in Table 2A-3 of the MUTCD. These standards require a sign maintenance plan that ensures that
minimum levels of retroreflectivity are maintained to provide adequate visibility. The following
five different methods of regular inspection of sign retroreflectivity are allowed:
· Visual nighttime inspections,
· Measured retroreflectivity,
· Expected life,
· Blanket replacement, and
· Control signs.
Sign retroreflectivity can be incorporated into an overall asset management plan. Expected life
of sign materials and structures can be included in the plan to expedite routine replacement and
maintenance. The retroreflective material on a sign can be expected to last 712 years depending
on the type of material selected and its sun exposure.
Ground-mounted signs may need to be cleaned annually to remove dirt and mud, particularly
those in splash zones and near areas where vehicle idling may produce soot build-up. Annual
daytime and nighttime visual drive-by inspections are recommended as part of a maintenance
schedule.
Sign supports, crash cushions, and guardrails may need routine maintenance and inspection
as well depending on the system used. Manufacturer's recommendations should be followed to
check for rust, loose bolts, etc.
