120 11 and 12

/*
 * One car from EAST, One car from WEST, then 2 cars from EAST
 */
void run11() {

    if (Fork() == 0) {
        Delay(10);
        driveRoad(WEST, 60);
        Exit();
    }

    //the following two child cars should go back to back
    if (Fork() == 0) {
        Delay(200);
        driveRoad(EAST, 60);
        Exit();
    }
    if (Fork() == 0) {
        Delay(200);
        driveRoad(EAST, 60);
        Exit();
    }

    driveRoad(EAST, 60);
    return;


}
/*
 * 2 cars showing up at once and both yielding to the same car
 * on the opposite side
 */
void run12() {

    if (Fork() == 0) {
        driveRoad(EAST, 60);
        Exit();
    }

    if (Fork() == 0) {
        driveRoad(EAST, 60);
        Exit();
    }
    if (Fork() == 0) {
        Delay(100);
        driveRoad(WEST, 60);
        Exit();
    }
    driveRoad(EAST, 10);
    return;
}