Concrete Subclasses - Exercise

In this exercise, you will develop concrete subclasses for the Vehicle class, the Bus, Car, Pedestrian, and Bicycle. These are the parameters for the four classes:

1. The Car class should be 6.0 meters long and have a maximum speed of 120 kilometers per hour.
2. The Bus class should be 18 meters long with a maximum speed of 92 kilometers per hour.
3. The Bicycle class should be 1.5 meters long with a maximum speed of 25 kilometers per hour.
4. The Pedestrian class should have a length of 0 (pedestrians tend to bunch up side by side at intersections rather than queue in line) and a maximum speed of 4 kilometers per hour.

For all of these, all you need to do is define the appropriate class with the necessary constructor that sets the values as specified. A more complex simulation might also add additional behavior to these subclasses, but we will not need that for our simple project.
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