5
S
ECTION
2
AFAD –
de
fi
ned as ‘Automated Flagger Assistance
Device’. An AFAD enables a
fl
agger(s) to be po-
sitioned away from the lane of traf
fi
c and is used
to control vehicle movements through temporary
traf
fi
c control zones. An AFAD is designed to be
remotely operated by either; a single
fl
agger at
one end of the TTC zone or at a central location, or
by separate
fl
aggers near each AFAD’s location.
Cycle –
the total time to complete one operation
of all phases.
Gate Arm –
also known as a boom, or boom gate.
The gate arm lowers to block the lane of traf
fi
c
when the AFAD displays a RED indication. When
the indication is changed to FLASH YELLOW, the
gate arm raises, permitting traf
fi
c to proceed ac-
cordingly.
Radio Remote Control –
sometimes referred to as
a ‘Hand Held Remote’ or ‘HHR’. This device per-
mits the user to manually operate the AFAD unit(s)
wirelessly from a safe distance.
MUTCD –
the Manual on Uniform Traf
fi
c Control
Devices. Contains regulatory information on the
use of AFAD’s in temporary traf
fi
c control situa-
tions on public roadways. Refer to MUTCD section
6E.06 Red/Yellow Lens Automated Flagger Assis-
tance Devices for further information regarding
the use of AFAD’s.
Phase –
a phase controls one or more signals
within a work zone. The number of phases avail-
able and how many signals are controlled with
each phase depends on the layout of the work
zone.
Nested/Locked Towing Con
fi
guration
- When
two trailers are locked together using three points
of connection to form a single, uni
fi
ed system for
tow using a single tongue/draw bar.
Tandem Tow Con
fi
guration
- When two trailers
are connected to each other and to the towing ve-
hicle using the trailers’ tongues. This results in two
pivot points; one at the towing vehicle and one at
the rear of the lead trailer.
2
T
D