Modes of Portable Traffic Signs

These portable traffic signs have now been around for some time and are used worldwide to provide a controlled vehicle and pedestrian environment under road work conditions. The function and deployment of portable traffic signs are regulated and specified by a number of government publications. It is well known that portable traffic signals are designed to be easily moved, installed and configurable for a range of applications. Portable traffic signs are optional range of power supplies, low emission diesels, solar assisted battery and standard battery configurations, so it is suggested to use.

Portable signals use the standard display of traffic signals: a green signal indication means it is safe to proceed, and a yellow indication means the green indication will be terminated. The portable traffic signal’s red indication means it is no longer safe to enter the work zone. A conflict monitor is used to ensure that conflicting traffic green indications are not presented simultaneously by the signals.

Portable traffic signals can be programmed to operate in one of several different modes. The different modes are described below. Two units can be operated on a pre-timed mode, which has a fixed duration green and clearance period for both approaching directions of traffic. Alternatively, the devices can be operated in one of several traffic actuated modes, which tend to be more responsive to real-time traffic demand at each signal. In any mode of operation, the portable traffic signals are programmed, so adequate time is available to clear vehicles once they have entered the one-lane work zone.

Identify locations for portable signal trailer units. Check for level, stable shoulder areas, or clear zone space to place the trailers. Record the length between the proposed trailer locations. The practical maximum length of activity area for one-way traffic signal control should not exceed 2600 feet. Shorter lengths are needed, especially if the activity area is on a roadway with limited sight distance and/or if higher volumes would encourage red-light violations.

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