PDF《Highway IDEA Program》

2 RESEARCH PROGRESS PROBLEM STATEMENT Burnt-out traffic lamps can prove to be more than just an inconvenience to motorists. The replacement of burnt-out lamps also causes considerable expense to state and regional DOTs. In addition, maintenance personnel are unnecessarily exposed to dangerous situations in order to perform the replacement. There is a need for a device or technology that would extend the life of traffic lamps, reduce maintenance expenditures, and reduce the exposure of personnel to dangerous situations. For the device to be useful, it must be compatible with the majority of existing hardware and meet all applicable standards for traffic-controlling equipment. The device also should be cost-effective to the end users. RESEARCH APPROACH CLS, Inc. contacted over

100 DOTs and municipalities to participate in this study. A mailing package was designed which included a six-week study questionnaire with verification testing steps intended to cover all functions of a traffic control load switch, a product description, NEMA Certification of Conformance, worksheets and specification sheets. CLS, Inc. then fabricated

200 test/production units to be used in this operational testing. After the production units were assembled and tested, a number were sent to the DOT signal laboratories participating in this study, while a number of units were retained for additional testing. Following are descriptions of the tests performed by the participating DOTs and municipalities, and their comments and feedback on the use and performance of the switch system. Part One: Inside Signal Lab Testing and Review Step 1: Examine pin

11 in your cinch connector in the signal cabinet in which you plan to conduct this study and identify whether or not it has been assigned as an AC Common/AC Neutral as specified by NEMA. Note: The Conservation Traffic Control Load Switch'

s Microprocessor requires an AC Common/Neutral to operate. If pin

11 is properly assigned, proceed to step 2. Otherwise, remove the white cap on the side of the CTCLS unit housing and plug in the AC Common/AC Neutral feed wire to the CTCLS external port and attach to AC Common/AC Neutral. Comments and Observations: Both pin

11 and the AC Common/Neutral external port in all cases provided the necessary AC Common/ Neutral feed required. Step 2: Insert the CTCLS into the signal cabinet in the cinch connector and verify that the CTCLS unit is mechanically compatible with the signal cabinet. Comments and Observations: Mechanically compatible in all NEMA Cabinets. Ho........