int button = 2;
int buttonValue = 0;
int redlight = 13;
int yellowlight = 12;
int greenlight = 11;

void setup(){
pinMode(redlight,OUTPUT);
pinMode(yellowlight,OUTPUT);
pinMode(greenlight,OUTPUT);
pinMode(button,INPUT);
digitalWrite(greenlight,HIGH);
}

void loop(){
buttonValue = digitalRead(button);
if (buttonValue == HIGH){
LightsChange();
delay(15000);
}
}

void LightsChange(){
digitalWrite(greenlight,LOW);
digitalWrite(yellowlight,HIGH);
delay(3000);
digitalWrite(yellowlight,LOW);
digitalWrite(redlight,HIGH);
delay(5000);

digitalWrite(yellowlight,HIGH);
delay(2000);

digitalWrite(yellowlight,LOW);
digitalWrite(redlight,LOW);
digitalWrite(greenlight,HIGH);
}