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.
The CNA is the lowest level of nursing; those who want to advance in the field may want to seek higher designations, such as the Licensed Practical Nurse (LPN) or Registered Nurse (RN) credential. LPNs need to earn a postsecondary certificate, while RNs need an undergraduate degree in order to practice.