Overloading a vehicle causes wheel bearings to fall, axle shafts to break and wheels to fall off, which leads to traffic wrecks. Excess weight in the rear of a car makes braking or steering difficult in an emergency. In short, trying to pack too much into your car causes vehicle damage, leads to traffic injuries and wastes gas. The easiest way is to look at your fully loaded car from behind. If the rear of the car is noticeably lower than it was before loading, you have over packed.
Vehicles loaded within manufacturer recommendations remain level.
When packing your car, don't try to fill all the empty space. Additional space in the trunk or on the roof rack doesn't necessarily mean the car can safely carry more weight. Traveling by Plane Many air travelers discover the rules on carry-on luggage only after they have packed and are at the airport, when it's too late to make changes. Airlines have different rules about what bags will be accepted, depending on the airline carrier and the particular type of aircraft that the airline is using on your flight. Always check with the individual airline about its specific bag rules before you head for the airport.