Usually, a handle has to be pushed down in order to move the cart, however, in some cases, such as London airports, the handle activates the brake. Very few carts, e.g. in developing countries such as Sri Lanka, do not have this feature.
Generally, pressing a handle is required to move the cart; however, in some cases, such as at London airports, the handle initiates the brake system. Only a few carts, including those found in developing nations like Sri Lanka, do not have this feature.