UFC 4-022-01
25 May 2005
6-14.1 Approach and Response Zone Lighting
The approach and response zones require typical roadway lighting. The roadway
lighting should provide enough intensity so that pedestrians, security personnel, islands,
signage, and other hazards are visible (Traffic Engineering and Highway Safety Bulletin:
Traffic Engineering for Better Gates.) The lighting should not be directed in the driver's
eyes and it should not backlight important signage. Table 6-4 provides the suggested
minimum illuminances for the various areas of an ECF.
Transitional lighting is necessary on approaches to the entry control point so that drivers
are not blinded during arrival and departure per IESNA HB-9. As discussed in the
IESNA HB-9, a "visually safe installation must be free of glare and of uncontrolled, large
differences in luminances. Maximum luminance ratios are important in order to avoid
temporary reductions in visibility because of changes in readaptation when alternately
looking at areas of widely different brightnesses." Follow the guidance provided in the
IESNA HB-9 for limiting glare and adaptation effects. The illumination level should be
reduced by 50 percent within the average distance traveled in 15 seconds in order to
create proper transitional lighting. As an example, at an ECF with a speed limit of 25
mph (40 km/ph) where the illumination level is 4 foot-candles, the illumination level
should be 2 foot-candles at 550 ft (168 m) and 1 foot-candle at 1,100 ft (334 m). A third
transition is not needed. Actual lighting locations must be determined on a case-by-
case basis and depend on the height, light source, and lens distribution.
6-14.2 Access Control Zone Lighting
In the Access Control Zone, area lighting is provided in the vicinity of the facilities. This
lighting should be provided at a higher level as indicated in Table 6-4, to facilitate
identification and inspection procedures. The lighting needs to illuminate the exterior
and interior of a vehicle to facilitate identification of the occupants and the vehicle
contents. Good vertical illuminance facilitates the identification and inspection
procedures per IESNA HB-9. Lighting levels above those indicated in Table 6-4, may
be appropriate where practical and desired. However, careful consideration of the
potential adaptation problems and the design of the lighting of surrounding areas are
required for the safety of traffic and security personnel.
It may also be necessary to provide additional task lighting in the ID and inspection
areas to support adequate identification of vehicle occupants and contents. Such
lighting should be directed transverse to the roadway; it will then illuminate the roadway
in front of the gatehouse, the driver, and the guard. Per IESNA HB-9, lighting may also
be mounted at or below pavement level to facilitate under vehicle inspection or
associated with under vehicle inspection systems (see Section 7-3).
6-14.3 Lighting Level and Quality
As discussed in the IESNA HB-9, the light source spectral power distribution is
important for identification and inspection tasks such as seeing hair, eye, clothing,
complexion, and vehicle colors. The ability to identify colors accurately and confidently
is determined by the light source spectral power distribution and the illuminance level.
This capability is commonly referred to as color rendition and is measured by the color
6-35
Previous Page
