WZSC Glossary

WZSC Glossary composed of MUTCD, NIOSH, OSHA, AASHTO

Browse the glossary using this index

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T

TAPER

A series of channelization devices (i.e. cones, tubular markers, drums) placed at an angle to the traffic flow to slowly guide traffic out of its normal path. Commonly used to close a travel lane or shoulder, or to shift traffic from one portion of the roadway to another.

Keyword(s):

TDD

telecommunication devices for the deaf

Temporary Pavement Markings

Markings used until "the earliest date when it is practical and possible to install pavement markings that meet [the full MUTCD standards] for pavement markings." Normally, it should not be necessary to leave temporary markings in place for more than 2 weeks [FHWA 2000 (MUTCD: Section 6F.66)].

Temporary Traffic Control Device

All signs, signals, markings, and other devices use to regulate, warn, or guide traffic in temporary traffic control zones.

Keyword(s):

Temporary Traffic Control Plan

"A temporary traffic control plan (TCP) describes temporary traffic control measures to be used for facilitating road users through a work zone. . . . [The plan] may range in scope from being very detailed, to simply referencing typical drawings contained in [the MUTCD], standard approved highway drawings and manuals, or specific drawings contained in contract documents" [FHWA 2000 (MUTCD: Section 6C.01)].

Keyword(s):

Temporary Traffic Control Signal

a traffic control signal that is installed for a limited time period.

Temporary Traffic Control Zone

an area of a highway where road user conditions are changed because of a work zone or incident by the use of temporary traffic control devices, flaggers, uniformed law enforcement officers, or other authorized personnel.

TERMINATION AREA

A short distance after the work space that allows traffic to clear the work space and return to normal operation.

Theoretical Gore

a longitudinal point at the upstream end of a neutral area at an exit ramp or channelized turn lane where the channelizing lines that separate the ramp or channelized turn lane from the adjacent through lane(s) begin to diverge, or a longitudinal point at the downstream end of a neutral area at an entrance ramp or channelized entering lane where the channelizing lines that separate the ramp or channelized entering lane from the adjacent through lane(s) intersect each other.

Timed Exit Gate Operating Mode

a mode of operation where the exit gate descent at a grade crossing is based on a predetermined time interval.

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