UFC 4-022-01
25 May 2005
Channelization islands provide a safe position for security personnel and serve as a
location to install present or future access control devices. A primary channelization
island should be provided between each incoming traffic lane in the Access Control
Zone (including potential reversible lanes). The proper path through and around raised
islands should be readily visible through the use of approach pavement markings. This
is especially important for an ECF, where there may be several islands for security
personnel performing ID checks and monitoring installation traffic. The island should be
raised, supported by a curb. The colors, line widths, and other design features of the
markings must adhere to the MUTCD.
The minimum primary channelization island should be 3 ft (914 mm) wide, 6 in (160
mm) high and 50 ft (15.2 m) long, although a length of 70 ft (21.3 m) is recommended.
The minimum length is required in order to support tandem processing. Where facilities
are located on an island, design the island to provide a minimum of 3 ft (914 mm) clear
on each side of the facility. The primary channelization islands should have crash
protection in accordance with paragraph 6-16.
Provide secondary channelization islands. The secondary island should be a
A/N
minimum of 3 ft (914 mm) in wide, 6 in (160 mm) in high and 10 ft (3 m) long.
6-6.2
Medians
Medians are constructed to:
Separate opposite traffic flows;
Provide a protected zone for left or U turns;
Minimize headlight glare;
Create an open green space for landscaping;
Provide space for signs; and
Provide space for a guard facilities
Medians can greatly improve the safety of the roadway. Medians can be either raised,
flushed, or depressed depending on the required functions per Traffic and Highway
Engineering. A flushed median could be used to facilitate the operation of reversible
lanes. A raised median surrounded by a curb should be utilized in the access control
zone for the central identification island. The minimum recommended median width is
12 ft (3.6 m). The desired median width is 30 ft (9.14 m), which protects vehicles
making left or U-turns. If the median is to provide turnaround capability for larger trucks,
it should be a minimum of 40 ft (12.19 m) wide. Automated access control systems may
be installed in the median as in the channelization island. Therefore, medians should
have infrastructure to support this potential.
Minimum median width should be 16 ft (4.88 m).
AF
6-6.3
Travel Lane Width
The minimum lane width is 10 ft (3.0 m). The preferred lane width is 12 ft (3.6 m).
Lanes approaching the gate should be 12 ft (3.6 m) wide, plus another 2 ft (0.61 m) on
6-16
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