#define R1 4
#define Y1 3
#define G1 2
#define G2 5
#define Y2 6
#define R2 7
#define R3 8
#define Y3 9
#define G3 10
#define R4 11
#define Y4 12
#define G4 13
void setup() {
 pinMode(R1,OUTPUT);
 pinMode(Y1,OUTPUT);
 pinMode(G1,OUTPUT);
 pinMode(R2,OUTPUT);
 pinMode(Y2,OUTPUT);
 pinMode(G2,OUTPUT);
 pinMode(R3,OUTPUT);
 pinMode(Y3,OUTPUT);
 pinMode(G3,OUTPUT);
 pinMode(R4,OUTPUT);
 pinMode(Y4,OUTPUT);
 pinMode(G4,OUTPUT);

}

void loop() {
  digitalWrite(R1,LOW); 
  digitalWrite(Y1,LOW); 
  digitalWrite(G1,HIGH); 
  digitalWrite(R2,HIGH); 
  digitalWrite(Y2,LOW); 
  digitalWrite(G2,LOW); 
  digitalWrite(R3,LOW);                //RED  2-4
  digitalWrite(Y3,LOW);             //GReen    1-3
  digitalWrite(G3,HIGH); 
  digitalWrite(R4,HIGH); 
  digitalWrite(Y4,LOW); 
  digitalWrite(G4,LOW);
  delay(4000);

  digitalWrite(R1,LOW); 
  digitalWrite(Y1,LOW); 
  digitalWrite(G1,HIGH); 
  digitalWrite(R2,LOW);               //Greneb 1-3
  digitalWrite(Y2,HIGH); 
  digitalWrite(G2,LOW);             //yellow    2-4
  digitalWrite(R3,LOW); 
  digitalWrite(Y3,LOW); 
  digitalWrite(G3,HIGH); 
  digitalWrite(R4,LOW); 
  digitalWrite(Y4,HIGH); 
  digitalWrite(G4,LOW);
  delay(2000);

  digitalWrite(R1,HIGH); 
  digitalWrite(Y1,LOW); 
  digitalWrite(G1,LOW); 
  digitalWrite(R2,LOW); 
  digitalWrite(Y2,LOW); 
  digitalWrite(G2,HIGH);          //RED  1-3
  digitalWrite(R3,HIGH);         //GReen     2-4 
  digitalWrite(Y3,LOW); 
  digitalWrite(G3,LOW); 
  digitalWrite(R4,LOW); 
  digitalWrite(Y4,LOW); 
  digitalWrite(G4,HIGH);
  delay(4000);

   digitalWrite(R1,LOW); 
  digitalWrite(Y1,HIGH); 
  digitalWrite(G1,LOW); 
  digitalWrite(R2,LOW);               //Greneb 2-4
  digitalWrite(Y2,LOW); 
  digitalWrite(G2,HIGH);             //yellow    1-3
  digitalWrite(R3,LOW); 
  digitalWrite(Y3,HIGH); 
  digitalWrite(G3,LOW); 
  digitalWrite(R4,LOW); 
  digitalWrite(Y4,LOW); 
  digitalWrite(G4,HIGH);
  delay(2000);


}