void setup() { 
    serial.begin(11000);
    pinmode(27,output );
    pinmode(14,output);
    pinmode(12,output);
    // traffic light 1
    pinmode(21,output);
    pinmode(19,output);
    pinmode(18,output) ;
    //traffic light 2
}
void loop() {
    digitalwrite(27,high) ; 
    digitalwrite(18,high);
    delay(1500);
    digitalwrite(27,low);
    digitalwrite(18,low);
    delay(1300);
    digitalwrite(14,high);
    digitalwrite(19,high);
    delay(1200);
    digitalwrite(14,low)
    digitalwrite(19,low);
    delay(1190);
    digitalwrite(12,high);
    digitalwrite(21,high);
    delay(1040);
    digitalwrite(12,low);
    digitalwrite(21,low);
    delay(1020); 
}