//Street traffic Light
int Redled=9;
int Yellowled=8;
int Greenled=7;


void setup() {
  // put your setup code here, to run once:
pinMode(Redled, OUTPUT);
pinMode(Yellowled, OUTPUT);
pinMode(Greenled,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(Redled, HIGH);
digitalWrite(Yellowled,LOW);
digitalWrite(Greenled, LOW);
delay(30000);
digitalWrite(Redled, LOW);
delay(100);
digitalWrite(Greenled, HIGH);
digitalWrite(Redled,LOW);
digitalWrite(Yellowled, LOW);
delay(20000);
digitalWrite(Greenled, LOW);
delay(100);
digitalWrite(Yellowled, HIGH);
digitalWrite(Redled, LOW);
digitalWrite(Greenled, LOW);
delay(3000);
digitalWrite(Yellowled, LOW);
delay(100);
}