| Word |
Description |
| CAAA |
Clean Air Act Amendments (1990) |
| Cable |
A group of separately insulated conductors wrapped together and covered with an outer jacket. |
| Calibrator |
For additional information on our Calibrator Click Here. |
| Calling Dectector |
A detector that is installed in a selected location to detect vehicles which many not otherwise be detected, and whose output may be modified by the controller unit (NEMA). This traditionally has meant a small area detector near the Stop Line, to detect vehicles the roadway from a driveway during the red or yellow signal. The detector is disconnected when the green signal is displayed so that extensions of green can only come from the appropriate Extension Detector. |
| Capacitance |
That property of a system of conductors and dielectrics which permits the storage of electricity separated charges when potential differences exist between the conductors. Its value is expressed as the ratio of an electric charge to a potential difference. |
| Card-Rack Mounted Detectors |
See Rack Mounted Detectors.
|
| Carryover Output |
The ability of a detector to continue its output for a predetermined length of time following an actuation (NEMA). See Extended Call Detector. |
| Cascade Modem |
For more information on our Cascade Modem, Click Here. |
| CC |
For more information on our Centurion CC Software, or to download a current copy Click Here |
| Centurion CC |
For more information on our Centurion CC Software, or to download a current copy Click Here |
| Centurion Field |
For more information on our Centurion Field software, or to download a current copy Click Here. |
| Centurion Gold |
For more information on our Centurion Gold Software, or to download a current copy Centurion Gold |
| Centurion Lite |
For more information on our Centurion Lite Software (Windows PDA), or to download a current copy Centurion Lite |
| Centurion Parks |
For more information on our Centurion Parks Software, or to download a current copy Centurion Parks |
| Chain |
Chain |
| Chamfer |
Diagonal saw slots at the corners of square or rectangular loops to reduce the angle of bend of the loop wires at the intersecting saw slots. |
| Change Interval |
The yellow interval following the green signal indicating the change to a conflicting phase. |
| Channel |
Electronic circuitry which functions as a loop detector unit (NEMA). |
| Circuit |
A closed path followed by an electric current. |
| Clearance Interval |
A red interval that may be shown following the yellow change interval before allowing a conflicting green signal to be displayed. |
| CMS |
Congestion Management System |
| Coil |
A coiled conductor, wound on a form or core which uses electro magnetic induction to cause changes in a current. |
| Conductance |
The measure of ability to conduct electricity. |
| Conductor |
A medium for transmitting electrical current. A conductor usually consists of copper or other materials. |
| Conduit |
A tube for protecting electrical wires, wiring or cables. |
| Conflicting Call |
See Serviceable Conflicting Call. |
| Conflicting Phases |
Two or more traffic phases which will cause interfering (i.e., conflicting) traffic movements if operated concurrently. |
| Continuous Presence Mode |
Detector output continues in any vehicle (first or last remaining) remains in the field of influence (NEMA). This definition does not imply that the use of this mode guarantees that the output will continue indefinitely, as most detectors are incapable of holding a call beyond a finite interval.
See Detector Mode. |
| Controlled Output |
The ability of a detector to produce a pulse that has a predetermined duration regardless of the length of time a vehicle is in the field of influence (NEMA). See Detector Mode. |
| Controller Assembly |
A complete electrical mechanism mounted in a cabinet for controlling the operation of a traffic control signal (NEMA).
See also: Traffic-Actuated Controller Assembly, Semi-Traffic-Actuated Controller Assembly, Full-Traffic-Actuated Controller, and/or Pedestrian-Actuated Controller Assembly |
| Controller Unit |
A controller unit is that portion of a controller assembly that is devoted to the selection and timing of signal displays (NEMA). Also referred to as the Dispatcher or Timer. |
| Critical Intersection Control (CIC) |
An algorithm employed in traffic systems to dynamically control the split at signalized locations where the traffic patterns are such that special control, responsive to changing conditions, is needed. |
| Critical Lane Detection |
A system of hardware and software designed to provide data on traffic flow for a selected lane, usually the heaviest volume lane on an approach to a signalized intersection. |
| Crosstalk |
The adverse interaction of any channel of a detector unit with any other detector channel (NEMA). It is mutual coupling of magnetic fields that produces interaction between two or more detector units in the same cabinet when the units are operating at similar frequencies. Crosstalk results in detector outputting an actuation in the absence of a vehicle.
This condition may also apply to inductive loop and devices that fail appropriate tuning, installation, configuration and/or maintenance. |
| CVC |
Continuous Vehicle Classifier |
| CVO |
Commercial Vehicle Operations |
| Cycle |
A complete sequence of all signal indications at an intersection. In an actuated controller, a complete cycle is dependent on the prescience of detector calls on all phases. |
| Cycle Length |
The time period in seconds required for a complete cycle. Cycle length is normally variable for actuated intersections unless they are a part of a coordinated system. |
