Modifies the definition of emergency vehicle to include certain vehicles operated by state, county, or municipal park rangers

HB 316 modifies Missouri's definition of "emergency vehicle" to explicitly include vehicles operated by state, county, or municipal park rangers. This change ensures park rangers' vehicles qualify for the same traffic exemptions as police, fire, and ambulance services - such as the right to exceed speed limits or ignore traffic signals during emergencies - when responding to urgent calls. The bill directly affects park rangers operating these vehicles and drivers who must yield the right-of-way to them under existing traffic laws. It does not create new policies but updates the legal definition to formally recognize park rangers' emergency response role.