int cycletime= 15; 
int yellowtime = 1;
int vehiclesratio[4] = {200,150, 700,180};
int effectivegreen, greenphase1, greenphase2, greenphase3, greenphase4;

//pin phase
#define phase_1_green 2
#define phase_1_yellow 3
#define phase_1_red 4

#define phase_2_green 5
#define phase_2_yellow 6
#define phase_2_red 7

#define phase_3_green 8
#define phase_3_yellow 9
#define phase_3_red 10

#define phase_4_green 11
#define phase_4_yellow 12
#define phase_4_red 13

void setup() {
  // put your setup code here, to run once:

  for(int x=2; x<14; x++) pinMode(x, OUTPUT);
  cycletime *= 1000;
  yellowtime *=1000;

  int tot = vehiclesratio[0] + vehiclesratio[1] + vehiclesratio[2] + vehiclesratio[3];
  effectivegreen = cycletime - (yellowtime * 4);

  greenphase1 = (float)vehiclesratio[0]/tot*effectivegreen;
  greenphase2 = (float)vehiclesratio[1]/tot*effectivegreen;
  greenphase3 = (float)vehiclesratio[2]/tot*effectivegreen;
  greenphase4 = (float)vehiclesratio[3]/tot*effectivegreen;

  digitalWrite(phase_1_red, HIGH);
  digitalWrite(phase_2_red, HIGH);
  digitalWrite(phase_3_red, HIGH);
  digitalWrite(phase_4_red, HIGH);
  delay(1000);

}

void loop() {
  // put your main code here, to run repeatedly:
//phase 1
  digitalWrite(phase_1_red, LOW);
  digitalWrite(phase_1_green, HIGH);
  delay(greenphase1);
  digitalWrite(phase_1_green, LOW);
  digitalWrite(phase_1_yellow, HIGH);
  delay(yellowtime);
  digitalWrite(phase_1_yellow, LOW);
  digitalWrite(phase_1_red, HIGH);
  //phase 2
  digitalWrite(phase_2_red, LOW);
  digitalWrite(phase_2_green, HIGH);
  delay(greenphase2);
  digitalWrite(phase_2_green, LOW);
  digitalWrite(phase_2_yellow, HIGH);
  delay(yellowtime);
  digitalWrite(phase_2_yellow, LOW);
  digitalWrite(phase_2_red, HIGH);
  
  //phase 3
  digitalWrite(phase_3_red, LOW);
  digitalWrite(phase_3_green, HIGH);
  delay(greenphase3);
  digitalWrite(phase_3_green, LOW);
  digitalWrite(phase_3_yellow, HIGH);
  delay(yellowtime);
  digitalWrite(phase_3_yellow, LOW);
  digitalWrite(phase_3_red, HIGH);

  //phase 4
  digitalWrite(phase_4_red, LOW);
  digitalWrite(phase_4_green, HIGH);
  delay(greenphase4);
  digitalWrite(phase_4_green, LOW);
  digitalWrite(phase_4_yellow, HIGH);
  delay(yellowtime);
  digitalWrite(phase_4_yellow, LOW);
  digitalWrite(phase_4_red, HIGH);
}