Chapter 5G. Temporary Traffic Control Zones
Section 5G.01 Introduction
The safety of road users, including pedestrians and bicyclists,
as well as personnel in work zones, should be an integral and high
priority element of every project in the planning, design, maintenance,
and construction phases. Part 6
should be reviewed for additional criteria, specific details, and
more complex temporary traffic control zone requirements. The following
principles should be applied to temporary traffic control zones:
- Traffic movement should be disrupted as little as possible.
- Road users should be guided in a clear and positive manner while
approaching and within construction, maintenance, and utility
- Routine inspection and maintenance of traffic control elements
should be performed both day and night.
- Both the contracting agency and the contractor should assign
at least one person on each project to have day-to-day responsibility
for assuring that the traffic control elements are operating effectively
and any needed operational changes are brought to the attention
of their supervisors.
Traffic control in temporary traffic control zones
should be designed on the assumption that road users will only reduce
their speeds if they clearly perceive a need to do so, and then
only in small increments of speed. Temporary traffic control zones
should not present a surprise to the road user. Frequent and/or
abrupt changes in geometrics and other features should be avoided.
Transitions should be well delineated and long enough to accommodate
driving conditions at the speeds vehicles are realistically expected
A Traffic Control Plan (see Section
6C.01) should be used for a temporary traffic control zone on
a low-volume road to specify particular traffic control devices
and features, or to reference typical drawings such as those contained
in Part 6.
Applications of speed reduction countermeasures and enforcement
can be effective in reducing traffic speeds in temporary traffic
Section 5G.02 Applications
Planned work phasing and sequencing should be the basis for the
use of traffic control devices for temporary traffic control zones.
Part 6 should be consulted for specific traffic control requirements
and examples where construction or maintenance work is planned.
Maintenance activities may not require extensive temporary traffic
control if the traffic volumes and speeds are low. The traffic applications
shown in Figures 6H-1,
of Part 6 are among those that may be used on low-volume roads.
For temporary traffic control zones on low-volume
roads that require flaggers, a single flagger may be adequate if
the flagger is visible to approaching traffic from all appropriate
Section 5G.03 Channelization
Channelization devices for nighttime use shall have the same retroreflective
requirements as specified for higher-volume roadways.
To alert, guide, and direct road users reasonably safely through
temporary traffic control zones on low-volume roads, tapers may
be used to move a road user out of the traffic lane and around the
work space using the spacing of devices that is described in Section
Section 5G.04 Markings
Pavement markings should be considered for temporary traffic control
zones on paved low-volume roads, especially roads that had existing
pavement markings or that have a surfaced detour or temporary roadway.
Interim pavement markings in a temporary traffic control zone may
not be needed based on the criteria for these markings in Section
Section 5G.05 Other
Traffic Control Devices
Other traffic control devices, such as other signs, signals, and
illumination that are used on low-volume roads in temporary traffic
control zones, but are not described in Part 5, shall conform with
the criteria contained in other Parts of this Manual.
Some of the signs that might be applicable in a temporary traffic
control zone on a low-volume road are shown in Figure 5G-1.
5G-1 Temporary Traffic Control Signs on Low-Volume Roads
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