How to make an emergency traffic light prototype? and did anybody know about traffic lights sequence ?

how to make an emergency traffic light prototype? and did anybody know about traffic lights sequence when at 'cross junction'.And what system is best for me to use; maybe PLC or Programmable Microprocessor? How does it work on the system? and how's the circuit diagram?Lastly i hope answer will be the... show more how to make an emergency traffic light prototype? and did anybody know about traffic lights sequence when at 'cross junction'.And what system is best for me to use; maybe PLC or Programmable Microprocessor? How does it work on the system? and how's the circuit diagram?Lastly i hope answer will be the cheapest on its' budget.
1 answer 1