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PIN ASSIGNMENT
int blue pin =13;
int yellow pin= 12;
int green pin=11;

void setup() {
    //set pins as output
pinMODE(bluePIN , OUTPUT)
pinMODE(yellowPIN ,OUTPUT)
pinMODE(greenPIN, OUTPUT)
}
void loop() {
//Blue light on
digitalwrite(bluePIN, HIGH);
digitalwrite(yellowPIN,LOW);
digitalwrite(greenPIN,LOW);
delay(6000) ; // 6 seconds

//Green light on
digitalwrite(bluePIN,LOW);
digitalwrite(yellowPIN,LOW);
digitalwrite(greenPIN,HIGH);
delay(6000) ; //6 seconds

// Yellow light on
digitalwrite(bluePIN,LOW);
digitalwrite(yellowPIN,HIGH);
digitalwrite(greenPIN,LOW);
delay(4000) ; // 4 seconds