diff --git a/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Bus.java b/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Bus.java
index 5abbe76..4909564 100644
--- a/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Bus.java
+++ b/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Bus.java
@@ -17,6 +17,10 @@ public class Bus extends Vehicle implements IFuelVehicle, IElectricVehicle {
 
     public Bus(String plate, String brand, String model, int potency, int boardNumber, int weight, int maxPassengers, EngineType engineType) {
         super(plate, brand, model, potency);
+        if (weight <= 0)
+            throw new IllegalArgumentException("Weight must be positive.");
+        if (maxPassengers <= 0)
+            throw new IllegalArgumentException("Max passengers must be positive.");
         this.boardNumber = boardNumber;
         this.weight = weight;
         this.maxPassengers = maxPassengers;
diff --git a/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Car.java b/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Car.java
index 86504ef..b45b745 100644
--- a/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Car.java
+++ b/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Car.java
@@ -16,6 +16,8 @@ public class Car extends Vehicle implements IElectricVehicle, IFuelVehicle {
 
     public Car(String plate, String brand, String model, int potency, int boardNumber, int trunkSize, EngineType engineType) {
         super(plate, brand, model, potency);
+        if (trunkSize <= 0)
+            throw new IllegalArgumentException("Trunk size must be positive.");
         this.boardNumber = boardNumber;
         this.trunkSize = trunkSize;
         this.engineType = engineType;
diff --git a/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Truck.java b/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Truck.java
index 17738d5..572abe9 100644
--- a/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Truck.java
+++ b/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Truck.java
@@ -12,6 +12,10 @@ public class Truck extends Vehicle implements IFuelVehicle {
 
     public Truck(String plate, String brand, String model, int potency, int boardNumber, int weight, int maxWeight) {
         super(plate, brand, model, potency);
+        if (weight <= 0)
+            throw new IllegalArgumentException("Weight must be positive.");
+        if (maxWeight <= 0)
+            throw new IllegalArgumentException("Max weight must be positive.");
         this.boardNumber = boardNumber;
         this.weight = weight;
         this.maxWeight = maxWeight;
diff --git a/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Vehicle.java b/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Vehicle.java
index a3edf88..87c3e4c 100644
--- a/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Vehicle.java
+++ b/1ano/2semestre/poo/src/aula08/ex1/Vehicles/Vehicle.java
@@ -1,6 +1,7 @@
 package aula08.ex1.Vehicles;
 
 import aula08.ex1.Interfaces.IKmTravelled;
+import utils.Validations;
 
 import java.util.Objects;
 
@@ -14,6 +15,10 @@ public abstract class Vehicle implements IKmTravelled {
     private int km;
 
     public Vehicle(String plate, String brand, String model, int potency) {
+        if (!Validations.validateVehiclePlate(plate))
+            throw new IllegalArgumentException("Invalid plate!");
+        if (potency <= 0)
+            throw new IllegalArgumentException("Potency must be positive");
         this.plate = plate;
         this.brand = brand;
         this.model = model;
diff --git a/1ano/2semestre/poo/src/utils/Validations.java b/1ano/2semestre/poo/src/utils/Validations.java
new file mode 100644
index 0000000..902d67c
--- /dev/null
+++ b/1ano/2semestre/poo/src/utils/Validations.java
@@ -0,0 +1,9 @@
+package utils;
+
+import java.util.regex.Pattern;
+
+public class Validations {
+    public static boolean validateVehiclePlate(String plate) {
+        return Pattern.matches("^[A-Z]{2}-\\d{2}-\\d{2}|\\d{2}-[A-Z]{2}-\\d{2}|\\d{2}-\\d{2}-[A-Z]{2}|[A-Z]{2}-\\d{2}-[A-Z]{2}|[A-Z]{2}-[A-Z]{2}-\\d{2}|\\d{2}-[A-Z]{2}-[A-Z]{2}$", plate);
+    }
+}