Under the MUTCD, which statement correctly defines the three main sign classifications?

1. Regulatory signs give notice of laws, warning signs give notice of not-readily-apparent situations, and guide signs show routes, destinations, distances, services, and other information
2. Regulatory signs are only for parking, warning signs are only for weather, and guide signs are only for restaurants
3. All signs are classified only by who owns the road
4. Signs are classified as red, yellow, or green with no functional meaning