What are the primary functions of a vehicle's exhaust system?

The primary functions of a vehicle's exhaust system center around managing the exhaust gases produced during the combustion process. The exhaust system plays a crucial role in directing these gases away from the engine and the passenger compartment, ensuring that harmful emissions do not re-enter the vehicle. By channeling exhaust gases safely away, the system helps to reduce the buildup of dangerous fumes, thus enhancing safety for passengers and reducing environmental harm.

Additionally, the exhaust system is designed to minimize noise produced by the engine. Components such as the muffler work to muffle the sound of the exhaust gases as they exit the vehicle, contributing to a quieter and thus more pleasant driving experience.

In contrast, the other options presented do not accurately reflect the primary functions of the exhaust system. Improving fuel economy and regulating speed pertain more to the engine's efficiency and performance rather than the exhaust system itself. Maintaining the health of the engine is a broader concern related to various systems in the vehicle, while monitoring tire pressure and wear is specifically tied to the vehicle's tire management system, unrelated to the exhaust system's functions.