Added Vehicle data structure

src/Breakable.java

@@ -0,0 +1,7 @@
+public interface Breakable {
+
+    public int getTimeToFix();
+    public boolean isBroken();
+    public boolean isInAccident();
+
+}

src/Sedan.java

@@ -0,0 +1,23 @@
+public class Sedan extends Vehicle implements Breakable {
+
+    private final int TIME_TO_FIX = 15; //in minutes
+    private boolean broken;
+    private boolean accident;
+    private int capacity;
+
+    public Sedan(double vehicleSize, boolean govtCar){
+        super(vehicleSize, govtCar);
+        capacity = 4; //Should make this attr. in vehicle.
+    }
+
+    public boolean isBroken(){ return broken; }
+    public boolean isInAccident(){ return accident; }
+    public int getTimeToFix(){ return TIME_TO_FIX; }
+    public int getCapacity() { return capacity; }
+
+    public void collide() { this.accident = true; }
+    public void _break() { this.broken = true; }
+
+    public void fixed() { this.broken = false; this.accident = false; }
+
+}

src/TrafficPoliceCar.java

@@ -0,0 +1,9 @@
+public class TrafficPoliceCar extends Vehicle {
+
+    private final double ADDED_EFFICIENCY = 0.05; // 5%
+
+    public TrafficPoliceCar(double vehicleSize, boolean govtCar){
+        super(vehicleSize, govtCar);
+    }
+
+}

src/Vehicle.java

@@ -0,0 +1,17 @@
+public abstract class Vehicle {
+
+    private double vehicleSize;
+    private boolean govtCar;
+
+    public Vehicle(double vehicleSize, boolean govtCar){
+        this.vehicleSize = vehicleSize;
+        this.govtCar = govtCar;
+    }
+    public double getVehicleSize() {
+        return vehicleSize;
+    }
+
+    public boolean isGovtCar() {
+        return govtCar;
+    }
+}