Arduino Crossroad and Traffic Lights

int s1=9;
int s2=7;
int s3=10;
int s4=11;
int trig=8;
int echo=12;                 
int vreme,dinstanca;
void setup() {

pinMode(s1,OUTPUT);
pinMode(s2,OUTPUT); 
pinMode(s3,OUTPUT);
pinMode(s4,OUTPUT);  
pinMode(trig,OUTPUT);
pinMode(echo,INPUT);
}

void loop() {
digitalWrite(trig,LOW);
delayMicroseconds(2);
digitalWrite(trig,HIGH);
delayMicroseconds(10);
digitalWrite(trig,LOW);
vreme=pulseIn(echo,HIGH);
dinstanca=vreme/2/29;
if(dinstanca<5){
botti();
}
  
}
void botti(){
  
digitalWrite(s1,HIGH);
digitalWrite(s2,LOW);
digitalWrite(s3,HIGH);
digitalWrite(s4,LOW);
delay(5000);   
digitalWrite(s1,LOW);
digitalWrite(s2,HIGH);
digitalWrite(s3,LOW);
digitalWrite(s4,HIGH);

  }