In this paper, a vehicles density dependent intelligent traffic light system based on
FPGA has been built. The intelligent traffic light system counts the number of
available vehicles in the sides of the traffic intersection via the sensors placed on
the ends of the road. Subsequently, it determines passage time required for each
side, depending on the density of existing vehicles in it, in order to pass the largest
number of vehicles in the intersection during a certain time. The proposed system
is built using VHDL, simulated using Xilinx ISE 9.2i package, and implemented
using Spartan-3A XC3S700A FPGA kit. Implementation and Simulation
behavioral model results show that proposed system fits the specified functional
requirements, and finds a solution to overcome the problem of traffic jam at