Surge of inertia brake systems may be used on trailers and semitrailers with a gross weight of _________ or less.

Surge or inertia brake systems are designed to engage automatically when the towing vehicle slows down, using the inertia generated by the deceleration to activate the brakes on the trailer or semitrailer. In Texas, the regulations specify that surge brake systems are applicable for trailers and semitrailers with a gross weight of 15,000 pounds or less. This ensures that these braking systems are effective and compliant with safety standards, as they are optimal for lighter loads where hydraulic systems can function reliably without additional complicated setups.

Understanding the weight limit is crucial, as it dictates the type of braking system that can be legally used on a trailer or semitrailer. For vehicles over this weight, more complex braking systems, such as electric brakes, are typically required to meet safety and performance needs.