Item # 1 DISPLAY SPECIFICATIONS _____1.1 Dimensions: The traffic facing surface shall not exceed 30” Horizontal and 36” Vertical (MUTCD speed limit dimensions for multi-lane road). 1.2 Character Display: The display area shall be capable of displaying 6” - 15” high characters showing oncoming vehicle speed AND characters reading “Slow Down” that are at minimum 6”. These two messages shall occupy the same space and shall not be displayed simultaneously. _____1.4 Finish: The inside of the display enclosure shall be painted black to facilitate heat dissipation. _____1.5 Glazing: If the display modules are not weatherproof, they shall be protected by a watertight sheet of non-yellowing UV-protected acrylic or polycarbonate. 1.6 General: The unit shall meet the requirements of MUTCD. Item # 2 DATA SYSTEM 2.1 Display: The unit shall be able to accurately display the speed of approaching vehicles. 2.2 Alert: The unit shall have a method of informing the driver they are exceeding the set speed limit (flashing, written message, etc.). 2.3 Logging: The speed and time of all approaching vehicles shall be logged and stored in an easily accessible format. 2.4 Stealth: The sign shall be capable of logging vehicles at all speeds without activating the display. 2.5 Data Collection: The data shall be accessible by an external device. Data collection software will be supplied with a sign which will provide data collection, report generation with tabular and graphical presentation, local data storage, and data dissemination. The data collection capabilities shall not require the use of cloud storage or proprietary reports that can only be accomplished through an on-going fee. 2.6 Sign Programming: Any software required to program the sign shall be supplied with the sign. The sign shall be able to be set to show, vehicle speed, the “slow down” message, or a blank display at different trigger speeds. Item # 3 POWER SYSTEM 3.1 Power System: The sign shall be powered by batteries that can be fully recharged within one hour by 120-volt AC power. 10 wall chargers will be provided. 3.2 Batteries: The number and amp hour rating of batteries shall be sufficient to operate the speed sign for 168 hours under normal operation on a road of AADT 6000 with no recharging and no solar assistance. This load shall include all communications and control devices. Low voltage cutoff which may disconnect the batteries, before full discharge, will be included in this requirement. This will be confirmed with field testing. 3.3 Power control circuitry: The power control circuitry should protect the batteries from overcharging by the 120-volt and solar chargers. It should also protect all the components from damage in the event of a short circuit, overload, or similar problem. It shall disconnect the load from the batteries when further discharging could damage the batteries. 3.4 Battery Type: Any batteries shall be of a composition that will allow the battery to recharge at low temperatures (below 32°) without damage, normally an AGM. 3.5 Solar Power: The solar panels will be capable of charging the batteries off a single hour of sunlight. Any connection between the solar panel and sign will be of a type that can be connected and disconnected without the use of tools. Item # 4 INSTALLATION: 4.2 A permanent mounting structure may be attached to a pole so as other components (radar detector, display, power system, communications) can easily be installed/ removed by a single person. 4.1 All parts of the installation required for operation shall be portable, in that they can be installed / removed by a single average person in under 30 minutes (not including permanent mounting devices) Banding is not an accepted type of mounting. 4.3 It shall be possible to mount/ remove the portable sections of the sign with minimal unpowered hand tools (screwdriver, wrench). 4.4 A method of locking the sign to the post/ mounting structure shall be used so that the sign cannot be removed by unauthorized individuals. Item # 5 TESTING: 5.1 The manufacturer shall test the signs, and spare parts. The manufacturer shall develop the test procedures and revise them as necessary to meet the Engineer’s approval. Prior to the testing, the manufacturer shall deliver all signs and spare parts to MaineDOT’s Augusta Industrial Drive facility, shall conduct all the tests in the test plans, and shall correct any deficiencies found. 5.2 When the manufacturer is confident that the sign and parts will pass the test, he shall arrange for MaineDOT’s representatives to witness the testing. He shall contact the Engineer at least two weeks in advance of the proposed testing date and shall arrange for testing to begin at a mutually convenient time. All testing will be done on the same day (or two days, if necessary) at a location picked by MaineDOT. The manufacturer shall provide all materials and equipment needed for testing and shall prepare a written report of the test results. 5.3 Sign Testing: The test procedure shall be designed to uncover manufacturing defects and shipping damage of all types. The test shall include a visual inspection of the sign. Among the aspects that must be tested are the following: All diagnostic routines provided by the manufacturer. Proper operation of every pixel, including uniform brightness at all brightness levels and proper current consumption. Proper wiring of the display modules, checked by displaying a 2-digit number. Appropriate display brightness for day and night conditions, and brightness when the sun at its worst condition for the location. Proper aiming of the display modules. 5.4 The test plan shall test every interface, feature, and function of the software, including features present but not required by these specifications. The testing shall demonstrate that the software deals appropriately with communication errors and operator errors. The testing shall confirm that the signs can be monitored and controlled from each of MaineDOT’s computers on which the software was installed. 5.5 Spare Parts Testing: Test the parts by substituting them into a working sign. Item # 6 SUPPORT 6.1 Technical Support: Phone numbers provided for technical support must be attended by a person who can answer questions or promptly find the answer to questions. An answering machine or answering service does not constitute technical support. The telephone support required by these specifications should be provided at least eight hours a day on all workdays. 6.2 On-Site Support: The manufacturer shall have a representative present when the installation contractor installs the first sign. The representative shall observe the installation, provide additional training for the contractor as required, and ensure that the sign is installed correctly. If the manufacturer’s representative is not confident that the contractor can install the remaining signs without assistance, the representative shall immediately notify the Engineer. 6.3 Telephone Support during Installation: The manufacturer shall provide telephone support to the installation contractor during installation. This support should be available until all the signs have been installed. 6.4 Telephone Support for Operation and Maintenance: The manufacturer shall provide telephone support to MaineDOT’s operations and maintenance staff for a period of one year following the acceptance of signs. Item # 7 PAINT ______7.1 All metal shall be free of rust and mill scale and prepared (bead blasted) for primer and finish paint coat. ______7.2 A two (2) part epoxy primer shall be applied to prepared metal surfaces to the minimum thickness of 3-5 mils dry. 7.3 All paint and primer should be lead-free. Item # 8 WARRANTY 8.1 18-months parts and labor, or standard manufacturer’s warranty shall apply whichever is greater. The warranty shall begin on the date of final delivery of all parts and equipment to MaineDOT. Item # 9 GENERAL 9.1 Wiring: All wiring shall be inaccessible to unauthorized people. All external wiring shall be enclosed in liquid-tight flexible conduit or flexible non-metallic tubing. All wiring and connections shall be of sufficient size to support all maximum currents continuously with a maximum of 5% percent voltage drop, including an “all pixels ON’ display, for at least three (3) hours. All wiring installation shall meet or exceed National Electrical Code Articles 300 and 310 methods and requirements. 9.2 Labeling: All terminals and connections shall be clearly labeled. Labels should be permanent.
