int d=140; // rotating light delay

int headlights=3;
int brakelights=6;


void setup() {
  // put your setup code here, to run once:
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);  
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(9,OUTPUT);
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
}

void blight() {  //bubble light
analogWrite(6, 75);
analogWrite(9, 255);
analogWrite(10, 75);
analogWrite(11, 0);
delay(d);
analogWrite(6, 0);
analogWrite(9, 75);
analogWrite(10, 255);
analogWrite(11, 75);
delay(d);
analogWrite(6, 75);
analogWrite(9, 0);
analogWrite(10, 75);
analogWrite(11, 255);
delay(d);
analogWrite(6, 255);
analogWrite(9, 75);
analogWrite(10, 0);
analogWrite(11, 75);
delay(d);


}


void loop() {
  // put your main code here, to run repeatedly: 
blight();
analogWrite(3,100);
analogWrite(5,255);
analogWrite(4,0);
blight();
analogWrite(5,0);
analogWrite(4,255);

}