IMSA 1 Questions and Answers with complete solution

Which are the two Traffic Signal Level 3 - Answer-Bench Electrical (Field) Personal safety is a matter of - Answer-Regulation and common sense The voltage that the signal operate on is... - Answer-120 VAC NEC - Answer-The national electrical code NESC - Answer-National electrical safety code Short duration maintenance or construction operation are defined in the MUTCD - Answer-Work that occupies an area for an hour or less at any time. MUTCD - Answer-The manual on uniform traffic control devices establishes the purposes of traffic control devices and the requirements for uniform traffic control devices throughout the united states. FHWA - Answer-The federal highway administration is responsible for developing and publishing the MUTCD in the united states The MUTCD allows states to develop their own manual on uniform traffic control devices if... - AnswerThe manual is in sufficient conformance to the Federal MUTCD. The detailed criteria for determining if the installation of a traffic signal should be considered are found in the... - Answer-MUTCD ( AKA The use of warrants) HAWK - Answer-Pedestrian hybrid beacon sometimes called High Intensity Actuated Crosswalk.Although most Signalized grade crossing are controlled by railroad flashing light signals with... - AnswerTwo circular red indications that flash in an alternating manner Ramp metering signals. - Answer-The signals placed on the entrance of a ramp to a roadway and usually have two sections: a circular green indication to allow a single vehicle to proceed at a time and circular red indication to stop all approaching vehicles. Other types of beacons include... - Answer-warning beacon (flashing circular yellow indications) and stop beacons (flashing circular red indications) Traffic signal phase - Answer-Phases are numbered 1 thru 8. Phase 2 and 6 are most commonly assgined to major street trhough movement Interval - Answer-Is the amount of time that a particular indication is given during a phase Rings - Answer-Each ring of a traffic signal controller is a series of conflicting phases that occur in an established order but can never simultaneously with each other. Barriers - Answer-Is a boundary point in the preferred sequence of a dual ring controller that both rings must simultaneously cross because the phases on one side of the barrier are for one street, and the phases on other side of the barrier are for the other street. concurrent phases - Answer-Are movements that happen at the same time because they do not conflict with one another. The minimum green or initial green time - Answer-Is the absolute minimum time that the green indication must be displayed. Passage time and extension time - Answer-Making the time long enough for a vehicle leaving the advance loop to get to a point where it will continue through the intersection if the light turns yellow. The maximum green time - Answer-Is the highest amount of time that the green light can be displayed when a conflicting call is present.Pedestrian Timing includes... - Answer-Both the walk interval include both the walk interval and the pedestrian change interval. A pedestrian change interval - Answer-Consisting of a flashing upraised hand. Pedestrian clearance time - Answer-a walking speed of 3.5 feet per second to at least the far side of the traveled way or to a median of sufficient width for pedestrians to wait. Pedestrian recall - Answer-Is a set for a phase, the controller treats the phase as having a pedestrian call at all-times. Cycle Length - Answer-All the coordinated traffic signals along a street must have the same cycle length during the same time of the day. Split - Answer-Is the number of seconds given to each phase at the intersection. Offset - Answer-is the number of seconds from a common signal cycle point to some known point in the cycle. Force Off - Answer-Is a command that forces the traffic signal controller to end the green display for an actuated phase. A Closed loop System - Answer-Is a distributed processor system with control logic provided at tree levels, local controller, on street master, and the central computer. Central Computer System - Answer-A computer at a centralized location makes decisions and communicates to each individual local controller in the system. Hybrid System - Answer-Combines the best features of closed loops with the best features of central computer systems.Hardwire Interconnect - Answer-The common term for a cable that transmits data between controllers and on-street master or between controllers and central computers. Interface Panel - Answer-copper cables are terminated in local controller cabinets.