But the tire speed rating system isnât without its quirks. For instance, the systemâs European roots give it unusual mile per hour maximums. Another such quirk is that the letter âHâ is out of place. Instead of appearing after âG,â it falls between âUâ and âVâ as does the speed to which it corresponds.
Among them: 1  RNs tend to have more responsibilities and independence in the workplace than LPNs. 2  RNs must usually complete more training than LPNs. 3  LPNs are in higher demand than RNs, nationally speaking.  RNs tend to earn more than LPNs.
RN and LPN: two different sets of initials on different name badges â and often two very different roles. Registered nurses (RN) have, at the minimum, a two-year degree or three-year diploma. Many have baccalaureate degrees.icensed practical nurses (LPN) have about a year of nursing education, often culminating in a certificate. A minority complete longer programs and walk away with a degree â often an Associate of Applied Science (AAS). Find an LPN or LVN program in your state. The role of an LPN is, as the name suggests, practical.