//jalur1
#define ledmerah1 4
#define ledkuning1 3
#define ledhijau1 2
//jalur2
#define ledmerah2 5
#define ledkuning2 6
#define ledhijau2 7
//jalur3
#define ledmerah3 8
#define ledkuning3 9
#define ledhijau3 10
//jalur4
#define ledmerah4 11
#define ledkuning4 12
#define ledhijau4 13

void setup() {
 pinMode(ledmerah1, OUTPUT); 
 pinMode(ledkuning1, OUTPUT); 
 pinMode(ledhijau1, OUTPUT); 
 pinMode(ledmerah2, OUTPUT); 
 pinMode(ledkuning2, OUTPUT); 
 pinMode(ledhijau2, OUTPUT);
 pinMode(ledmerah3, OUTPUT); 
 pinMode(ledkuning3, OUTPUT); 
 pinMode(ledhijau3, OUTPUT);
 pinMode(ledmerah4, OUTPUT); 
 pinMode(ledkuning4, OUTPUT); 
 pinMode(ledhijau4, OUTPUT);

}

void loop() {
 //jalur 1 jalan
 digitalWrite(ledmerah1, LOW);
 digitalWrite(ledkuning1, LOW);
 digitalWrite(ledhijau1, HIGH); 
 digitalWrite(ledmerah2, HIGH);
 digitalWrite(ledkuning2, LOW);
 digitalWrite(ledhijau2, LOW); 
 digitalWrite(ledmerah3, HIGH);
 digitalWrite(ledkuning3, LOW);
 digitalWrite(ledhijau3, LOW);
 digitalWrite(ledmerah4, HIGH);
 digitalWrite(ledkuning4, LOW);
 digitalWrite(ledhijau4, LOW);
 delay(3000);
//jalur 1 siap siap berhenti,jalur 2 siap siap jalan
 digitalWrite(ledmerah1, LOW);
 digitalWrite(ledkuning1, HIGH);
 digitalWrite(ledhijau1, HIGH); 
 digitalWrite(ledmerah2, HIGH);
 digitalWrite(ledkuning2, HIGH);
 digitalWrite(ledhijau2, LOW); 
 digitalWrite(ledmerah3, HIGH);
 digitalWrite(ledkuning3, LOW);
 digitalWrite(ledhijau3, LOW);
 digitalWrite(ledmerah4, HIGH);
 digitalWrite(ledkuning4, LOW);
 digitalWrite(ledhijau4, LOW);
 delay(3000);
//jalur 2 jalan
 digitalWrite(ledmerah1, HIGH);
 digitalWrite(ledkuning1, LOW);
 digitalWrite(ledhijau1, LOW); 
 digitalWrite(ledmerah2, LOW);
 digitalWrite(ledkuning2, LOW);
 digitalWrite(ledhijau2, HIGH); 
 digitalWrite(ledmerah3, HIGH);
 digitalWrite(ledkuning3, LOW);
 digitalWrite(ledhijau3, LOW);
 digitalWrite(ledmerah4, HIGH);
 digitalWrite(ledkuning4, LOW);
 digitalWrite(ledhijau4, LOW);
 delay(3000);
//jalur 2 siap siap berhenti,jalur 3 siap siap jalan
 digitalWrite(ledmerah1, HIGH);
 digitalWrite(ledkuning1, LOW);
 digitalWrite(ledhijau1, LOW); 
 digitalWrite(ledmerah2, LOW);
 digitalWrite(ledkuning2, HIGH);
 digitalWrite(ledhijau2, HIGH); 
 digitalWrite(ledmerah3, HIGH);
 digitalWrite(ledkuning3, HIGH);
 digitalWrite(ledhijau3, LOW);
 digitalWrite(ledmerah4, HIGH);
 digitalWrite(ledkuning4, LOW);
 digitalWrite(ledhijau4, LOW);
 delay(3000);
//jalur 3 jalan
 digitalWrite(ledmerah1, HIGH);
 digitalWrite(ledkuning1, LOW);
 digitalWrite(ledhijau1, LOW); 
 digitalWrite(ledmerah2, HIGH);
 digitalWrite(ledkuning2, LOW);
 digitalWrite(ledhijau2, LOW); 
 digitalWrite(ledmerah3, LOW);
 digitalWrite(ledkuning3, LOW);
 digitalWrite(ledhijau3, HIGH);
 digitalWrite(ledmerah4, HIGH);
 digitalWrite(ledkuning4, LOW);
 digitalWrite(ledhijau4, LOW);
 delay(3000);
//jalur 3 siap siap berhenti,jalur 4 siap siap jalan
 digitalWrite(ledmerah1, HIGH);
 digitalWrite(ledkuning1, LOW);
 digitalWrite(ledhijau1, LOW); 
 digitalWrite(ledmerah2, HIGH);
 digitalWrite(ledkuning2, LOW);
 digitalWrite(ledhijau2, LOW); 
 digitalWrite(ledmerah3, LOW);
 digitalWrite(ledkuning3, HIGH);
 digitalWrite(ledhijau3, HIGH);
 digitalWrite(ledmerah4, HIGH);
 digitalWrite(ledkuning4, HIGH);
 digitalWrite(ledhijau4, LOW);
 delay(3000);
//jalur 4 jalan
 digitalWrite(ledmerah1, HIGH);
 digitalWrite(ledkuning1, LOW);
 digitalWrite(ledhijau1, LOW); 
 digitalWrite(ledmerah2, HIGH);
 digitalWrite(ledkuning2, LOW);
 digitalWrite(ledhijau2, LOW); 
 digitalWrite(ledmerah3, HIGH);
 digitalWrite(ledkuning3, LOW);
 digitalWrite(ledhijau3, LOW);
 digitalWrite(ledmerah4, LOW);
 digitalWrite(ledkuning4, LOW);
 digitalWrite(ledhijau4, HIGH);
 delay(3000);
}