(1) Traffic Control Device Studies
These studies ensure that traffic devices are adequate and are placed where needed. Three types of
control devices may be studied separately or in combination. The three types of control devices are
signs, power operated signals, and pavement markings.
All of these devices are used to regulate, warn, or guide traffic. You should study these devices to
evaluate conditions and locations and to determine if the intended message is adequate. This study
can also help in inventory operations.
The Manual On Uniform Traffic Control Devices sets forth the basic principles that govern the design
and use of traffic-control devices. After your initial study, make weekly or monthly checks based on
checking specific geographic areas or using daily patrol reports.
(2) Traffic Signal Observance Studies
These studies are made to check driver observance of traffic control signals at intersections. The
studies can be used to determine the need for--
Re-timing of devices.
Other physical changes.
(3) Origin-Destination Studies
These studies are used to determine travel patterns during a typical day. They are useful in long-range
traffic planning, especially when substantial changes in installation mission or strength is anticipated.
These studies analyze trips. Trips are defined as one-way movement from where a person starts
(origin) to where the person is going (destination). Trips are classified as follows:
o Internal - From one point to another on post.
o External - From on-post to off-post or vice versa.
o Through - From off-post to off-post, going through the installation.
(4) Vehicle Occupancy Studies
These studies are used to determine the number of occupants in a vehicle passing a given location or
entering or exiting a particular road. These studies can be used in conjunction with volume studies.
(5) Speed Studies
Speed studies are used to determine--