Car Volume Based Traffic Light System using IR sensor (Arduino)

Joerel Bacanican someone give me advice about the code for this project

this is my sample code

int r1 = 1;// pin for the LED
int g1 = 2;
int r2 = 4;
int g2 = 5;
int r3 = 7;
int g3 = 8;
int r4 = 10;
int g4 = 11;
int y0 = 13;// all yellow LED are connected in parallel
int timer = 7000;// set initial timer for the system after first boot
int isObstaclePinA = 3;// pin for the IR sensor
int isObstaclePinB = 6;
int isObstaclePinC = 9;
int isObstaclePinD = 12;
int var = 0;

void setup () {
pinMode(r1, OUTPUT);
pinMode(g1, OUTPUT);
pinMode(r2, OUTPUT);
pinMode(g2, OUTPUT);
pinMode(r3, OUTPUT);
pinMode(g3, OUTPUT);
pinMode(r4, OUTPUT);
pinMode(g4, OUTPUT);
pinMode(y0, OUTPUT);
pinMode(isObstaclePinA, INPUT);
pinMode(isObstaclePinB, INPUT);
pinMode(isObstaclePinC, INPUT);
pinMode(isObstaclePinD, INPUT);

}



void loop () {

switch (var) { // for enabling the switch command

case 1:
if (isObstaclePinA == HIGH);
digitalWrite(isObstaclePinB, LOW);
digitalWrite(isObstaclePinC, LOW);
digitalWrite(isObstaclePinD, LOW);
digitalWrite(g1, HIGH);// LED lights on
digitalWrite(r1, LOW);
digitalWrite(r2, HIGH);
digitalWrite(r3, HIGH);
digitalWrite(r4, HIGH);
delay(timer); // time the lights will turn on

digitalWrite(y0, HIGH);
delay(3000); // time the yellow LED will light
for (isObstaclePinA == HIGH; timer < 50000; timer + 5000); // for adding seconds in the timer every time the sensor responds
break;

case 2: // next case
if (isObstaclePinB == HIGH);
digitalWrite(isObstaclePinA, LOW);
digitalWrite(isObstaclePinC, LOW);
digitalWrite(isObstaclePinD, LOW);
digitalWrite(g2, HIGH);
digitalWrite(r2, LOW);
digitalWrite(r1, HIGH);
digitalWrite(r3, HIGH);
digitalWrite(r4, HIGH);
delay(timer);

digitalWrite(y0, HIGH);
delay(3000);
for (isObstaclePinB == HIGH; timer < 50000; timer + 5000);
break;

case 3:
if (isObstaclePinC == HIGH);
digitalWrite(isObstaclePinB, LOW);
digitalWrite(isObstaclePinA, LOW);
digitalWrite(isObstaclePinD, LOW);
digitalWrite(g3, HIGH);
digitalWrite(r3, LOW);
digitalWrite(r1, HIGH);
digitalWrite(r2, HIGH);
digitalWrite(r4, HIGH);
delay(timer);

digitalWrite(y0, HIGH);
delay(3000);
for (isObstaclePinC == HIGH; timer < 50000; timer + 5000);
break;

case 4:
if (isObstaclePinD == HIGH);
digitalWrite(isObstaclePinB, LOW);
digitalWrite(isObstaclePinC, LOW);
digitalWrite(isObstaclePinA, LOW);
digitalWrite(g4, HIGH);
digitalWrite(r4, LOW);
digitalWrite(r1, HIGH);
digitalWrite(r2, HIGH);
digitalWrite(r3, HIGH);
delay(timer);

digitalWrite(y0, HIGH);
delay(3000);
for (isObstaclePinD == HIGH; timer < 50000; timer + 5000);
break;

May i know your project problem Statement?

can you help me do the code for this?

this is how the system will work

the IR sensor will count the no. of vehicle then convert it to time that the green light will turn on.

I'm having trouble dealing with it
thank you