References: https://vlsicoding.blogspot.com/2013/11/verilog-code-for-traffic-light-control.html https://www.fpga4student.com/2016/11/verilog-code-for-traffic-light-system.html#:~:text=A%20Verilog%20source%20code%20for,higher%20priority%20than%20the%20farm.