In this example we create a random speed jump by a certain constant.
private Random random = new Random();
private static final double SPEED_M_PER_S = 2.2352; /* 5 MPH */
private static final double MAX_RANDOM_DELTA = 0.13;
double speed = SPEED_M_PER_S
+ Math.min(MAX_RANDOM_DELTA, random.nextDouble())
* (random.nextBoolean() ? -1 : 1);
