Specifications include, but are not limited to: General The portable traffic control system shall consist of towable, trailer-mounted, self-contained units. Each unit shall be equipped with two LED traffic signals and designed to utilize solar electric modules with storage batteries as the primary power source for the traffic signals. Environmental Conditions Unless specified otherwise, all components shall be constructed to meet or exceed the following environmental conditions: Temperature Range: -40F to 160F. Vibration: Components shall survive all vibration in any axis normally encountered during transportation. Humidity: 0% to 100%. Wind: Each unit shall be capable of remaining stable and operating in wind up to 80 mph. Controller Each unit shall include a solid-state, digital, micro-processor based, traffic controller capable of operating the signals in accordance with the Manual on Uniform Traffic Control Devices (MUTCD) requirements and NEMA standard TS1. The controller shall not be able to be powered unless the conflict monitor is installed and functioning properly. The controller shall be capable of fixed time, traffic actuated and manual control operation. The controller shall provide user-selected standby modes of red, red flash and yellow flash mode. The default standby mode shall be red flash. The controller shall provide built-in night dimming capability. Conflict Monitor Each system shall incorporate a conflict monitor to detect the presence of conflicting indications, the absence of proper voltages, and proper operation of the controller. Upon detection of a conflict or loss of communication, the conflict monitor shall transfer all signals into standby mode. The conflict monitor shall conform to NEMA standard TS1. Vehicle Detector Each unit shall have a microwave vehicle detector mounted on it. The detector shall be capable of detecting up to two lanes and have a minimum detection range of 350 feet. Enclosures Control equipment and battery enclosures shall be secure from weather, theft and vandalism. An integral rigid doorstop shall be included in each enclosure so that the door can be fixed in the open position. Each door shall be secured with a standard traffic signal controller cabinet Corbin # 2 lock. The keyhole for the lock shall have a cover attached to the door with a single rivet. Each battery enclosure shall have a minimum of one-half inch (1/2”) of insulating sheeting around the battery to minimize heat transfer between the battery and the enclosure wall. Each battery enclosure shall also be equipped to keep the batteries securely in place during transport. Interconnection Units in a system shall be capable of being communicating with one another via hardwire and radio interconnect. Radio interconnect shall include spread spectrum radio modems, cables, between units. Power Supply Primary power shall be solar based. Each unit shall contain a solar cell system for battery charging. The number of cells shall be determined by the wattage of two, three-section signal indications, operating twenty-four hours per day, seven days per week, and the average hours of sun per day (winter) in the state of Kentucky. These cells shall feature an antireflective coating and low iron glass covering. The cells shall be encapsulated to protect them from the environment. Each module shall provide a weather-tight method for connecting the array output cable to the module terminals. The modules shall be designed to provide rated power output for a minimum of 15 years. The system shall be designed for operation at an average monthly insolation on a horizontal surface and average monthly temperature for use anywhere in the state.
