Traffic Light System
1. Introduction:
Travel became very difficult between the places of the city because of traffic jams. Traffic jams are an important problem in many modern cities around the world. When populations increase the number of cars is increasing. Therefore, traffic congestion is growing. Traffic jams lead to a loss of time for people, the loss of opportunity, and nervous tension.
Most traffic light controllers are fixed-cycle controllers, in which all alternative traffic light settings get a particular time-interval for being green. [1]
In the fixed time traffic light control system, cannot get the optimal solution for the traffic congestion. This leads to use other systems. One of these systems is an intelligent traffic light system. [2]
Most of
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FPGA model of intelligent traffic light system
The FPGA model of intelligent traffic light system is built using VHDL (Very high speed Hardware Description Language), and implemented and simulated using Xilinx ISE 9.2i package. This model consists of two parts, entity declaration and process, the entity declaration part, shown in Figure (3), is used to declare the signals of the intelligent traffic light system. The process part will be responsible for the processing traffic light system signals under the conditions described previously, and controlled the illuminations of traffic light according to system state.
Figure (4) shows the intelligent traffic light signals, the input signals (Cin1, Cin2, Cin3, and Cin4) represent the car input, that receive the signal from the sensor to indicate that the vehicle entered to the side of intersection. Car output (Cout1, Cout2, Cout3, and Cout4); its input signals come from a sensor as an indicator that the vehicle has come out of the intersection. The lights of the traffic light system are controlled by the output signals (R1, Y1, G1, R2, Y2, G2, R3, Y3, G3, R4, Y4, and
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The proposed system depends on a simple algorithms and equations while other system based on complicate algorithms like JADE in [3] and Fuzzy Logic in [4]. Moreover, most of other systems use computer to control the traffic lights and this make it more liable to be exposed to hacking and system errors as in [2,6]. Also, its ability to use any type of sensors, unlike some other systems that require specific types of sensors
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